Remove @url comments from d.ts files (#4449)

These have no function and are not tested, probably incorrect in many
situations.

cli/js/lib.deno.ns.d.ts

@@ -340,8 +340,6 @@ declare namespace Deno {
    */
   export function execPath(): string;
 
-  // @url js/dir.d.ts
-
   /**
    * **UNSTABLE**: maybe needs permissions.
    *
@@ -382,8 +380,6 @@ declare namespace Deno {
   export const EOF: unique symbol;
   export type EOF = typeof EOF;
 
-  // @url js/io.d.ts
-
   /** **UNSTABLE**: might remove `"SEEK_"` prefix. Might not use all-caps. */
   export enum SeekMode {
     SEEK_START = 0,
@@ -518,8 +514,6 @@ declare namespace Deno {
    */
   export function toAsyncIterator(r: Reader): AsyncIterableIterator<Uint8Array>;
 
-  // @url js/files.d.ts
-
   /** Synchronously open a file and return an instance of the `File` object.
    *
    *       const file = Deno.openSync("/foo/bar.txt", { read: true, write: true });
@@ -716,8 +710,6 @@ declare namespace Deno {
    */
   export type OpenMode = "r" | "r+" | "w" | "w+" | "a" | "a+" | "x" | "x+";
 
-  // @url js/tty.d.ts
-
   /** **UNSTABLE**: newly added API
    *
    *  Check if a given resource is TTY. */
@@ -728,8 +720,6 @@ declare namespace Deno {
    *  Set TTY to be under raw mode or not. */
   export function setRaw(rid: number, mode: boolean): void;
 
-  // @url js/buffer.d.ts
-
   /** A variable-sized buffer of bytes with `read()` and `write()` methods.
    *
    * Based on [Go Buffer](https://golang.org/pkg/bytes/#Buffer). */
@@ -816,8 +806,6 @@ declare namespace Deno {
   /** Synchronously write all the content of `arr` to `w`. */
   export function writeAllSync(w: SyncWriter, arr: Uint8Array): void;
 
-  // @url js/mkdir.d.ts
-
   export interface MkdirOptions {
     /** Defaults to `false`. If set to `true`, means that any intermediate
      * directories will also be created (as with the shell command `mkdir -p`).
@@ -861,8 +849,6 @@ declare namespace Deno {
     mode?: number
   ): Promise<void>;
 
-  // @url js/make_temp.d.ts
-
   export interface MakeTempOptions {
     /** Directory where the temporary directory should be created (defaults to
      * the env variable TMPDIR, or the system's default, usually /tmp). */
@@ -941,8 +927,6 @@ declare namespace Deno {
    * Requires `allow-write` permission. */
   export function makeTempFile(options?: MakeTempOptions): Promise<string>;
 
-  // @url js/chmod.d.ts
-
   /** Synchronously changes the permission of a specific file/directory of
    * specified path.  Ignores the process's umask.
    *
@@ -983,8 +967,6 @@ declare namespace Deno {
    * Requires `allow-write` permission. */
   export function chmod(path: string, mode: number): Promise<void>;
 
-  // @url js/chown.d.ts
-
   /** Synchronously change owner of a regular file or directory. Linux/Mac OS
    * only at the moment.
    *
@@ -1007,8 +989,6 @@ declare namespace Deno {
    */
   export function chown(path: string, uid: number, gid: number): Promise<void>;
 
-  // @url js/utime.d.ts
-
   /** **UNSTABLE**: needs investigation into high precision time.
    *
    * Synchronously changes the access and modification times of a file system
@@ -1039,8 +1019,6 @@ declare namespace Deno {
     mtime: number | Date
   ): Promise<void>;
 
-  // @url js/remove.d.ts
-
   export interface RemoveOptions {
     /** Defaults to `false`. If set to `true`, path will be removed even if
      * it's a non-empty directory. */
@@ -1065,8 +1043,6 @@ declare namespace Deno {
    * Requires `allow-write` permission. */
   export function remove(path: string, options?: RemoveOptions): Promise<void>;
 
-  // @url js/rename.d.ts
-
   /** Synchronously renames (moves) `oldpath` to `newpath`. If `newpath` already
    * exists and is not a directory, `renameSync()` replaces it. OS-specific
    * restrictions may apply when `oldpath` and `newpath` are in different
@@ -1086,8 +1062,6 @@ declare namespace Deno {
    * Requires `allow-read` and `allow-write`. */
   export function rename(oldpath: string, newpath: string): Promise<void>;
 
-  // @url js/read_file.d.ts
-
   /** Reads and returns the entire contents of a file.
    *
    *       const decoder = new TextDecoder("utf-8");
@@ -1106,8 +1080,6 @@ declare namespace Deno {
    * Requires `allow-read` permission. */
   export function readFile(path: string): Promise<Uint8Array>;
 
-  // @url js/file_info.d.ts
-
   /** A FileInfo describes a file and is returned by `stat`, `lstat`,
    * `statSync`, `lstatSync`. A list of FileInfo is returned by `readdir`,
    * `readdirSync`. */
@@ -1176,8 +1148,6 @@ declare namespace Deno {
     isSymlink(): boolean;
   }
 
-  // @url js/realpath.d.ts
-
   /** Returns absolute normalized path with, symbolic links resolved.
    *
    *       const realPath = Deno.realpathSync("./some/path");
@@ -1192,8 +1162,6 @@ declare namespace Deno {
    * Requires `allow-read` permission. */
   export function realpath(path: string): Promise<string>;
 
-  // @url js/read_dir.d.ts
-
   /** UNSTABLE: need to consider streaming case
    *
    * Synchronously reads the directory given by `path` and returns an array of
@@ -1213,8 +1181,6 @@ declare namespace Deno {
    * Requires `allow-read` permission. */
   export function readdir(path: string): Promise<FileInfo[]>;
 
-  // @url js/copy_file.d.ts
-
   /** Synchronously copies the contents and permissions of one file to another
    * specified path, by default creating a new file if needed, else overwriting.
    * Fails if target path is a directory or is unwritable.
@@ -1235,8 +1201,6 @@ declare namespace Deno {
    * Requires `allow-write` permission on toPath. */
   export function copyFile(fromPath: string, toPath: string): Promise<void>;
 
-  // @url js/read_link.d.ts
-
   /** Returns the destination of the named symbolic link.
    *
    *       const targetPath = Deno.readlinkSync("symlink/path");
@@ -1251,8 +1215,6 @@ declare namespace Deno {
    * Requires `allow-read` permission. */
   export function readlink(path: string): Promise<string>;
 
-  // @url js/stat.d.ts
-
   /** Resolves to a `Deno.FileInfo` for the specified `path`. If `path` is a
    * symlink, information for the symlink will be returned.
    *
@@ -1289,8 +1251,6 @@ declare namespace Deno {
    * Requires `allow-read` permission. */
   export function statSync(path: string): FileInfo;
 
-  // @url js/link.d.ts
-
   /** Creates `newpath` as a hard link to `oldpath`.
    *
    *       Deno.linkSync("old/name", "new/name");
@@ -1305,8 +1265,6 @@ declare namespace Deno {
    * Requires `allow-read` and `allow-write` permissions. */
   export function link(oldpath: string, newpath: string): Promise<void>;
 
-  // @url js/symlink.d.ts
-
   /** **UNSTABLE**: `type` argument type may be changed to `"dir" | "file"`.
    *
    * Creates `newpath` as a symbolic link to `oldpath`. The type argument can be
@@ -1337,8 +1295,6 @@ declare namespace Deno {
     type?: string
   ): Promise<void>;
 
-  // @url js/write_file.d.ts
-
   /** Options for writing to a file. */
   export interface WriteFileOptions {
     /** Defaults to `false`. If set to `true`, will append to a file instead of
@@ -1533,8 +1489,6 @@ declare namespace Deno {
     constructor(state: PermissionState);
   }
 
-  // @url js/truncate.d.ts
-
   /** Synchronously truncates or extends the specified file, to reach the
    * specified `len`.
    *