improve docs (#5872)

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## First steps
This page contains some simple examples to teach you about the fundamentals of
Deno.
This page contains some examples to teach you about the fundamentals of Deno.
This document assumes that you have some prior knowledge of JavaScript,
especially about `async`/`await`. If you have no prior knowledge of JavaScript,
@ -14,8 +13,8 @@ before attempting to start with Deno.
Deno is a runtime for JavaScript/TypeScript which tries to be web compatible and
use modern features wherever possible.
Browser compatibility means a simple `Hello World` program in Deno is the same
as the one you can run in the browser:
Browser compatibility means a `Hello World` program in Deno is the same as the
one you can run in the browser:
```ts
console.log("Welcome to Deno 🦕");
@ -106,10 +105,10 @@ Try the program:
deno run --allow-read https://deno.land/std/examples/cat.ts /etc/passwd
```
### A simple TCP server
### TCP server
This is an example of a simple server which accepts connections on port 8080,
and returns to the client anything it sends.
This is an example of a server which accepts connections on port 8080, and
returns to the client anything it sends.
```ts
const hostname = "0.0.0.0";