fix: a bunch of typos

This PR will fix some typos detected by [typos].

There are also some other typos in the function names, variable names, and file
names, which I leave as they are. I'm more certain that typos in comments
should be fixed.

[typos]: https://github.com/crate-ci/typos

crates/ide-diagnostics/src/handlers/missing_match_arms.rs

@@ -750,7 +750,7 @@ fn main() {
 enum Foo { A }
 fn main() {
     // FIXME: this should not bail out but current behavior is such as the old algorithm.
-    // ExprValidator::validate_match(..) checks types of top level patterns incorrecly.
+    // ExprValidator::validate_match(..) checks types of top level patterns incorrectly.
     match Foo::A {
         ref _x => {}
         Foo::A => {}