docs: fix typos (#2002)

docs/src/pages/docs/hello-world.md

@@ -1,6 +1,6 @@
 ---
 title: Hello World
-description: Helle World
+description: Anchor - Hello World
 ---
 
 To initialize a new project, simply run:

docs/src/pages/docs/high-level-overview.md

@@ -1,6 +1,6 @@
 ---
 title: High-level Overview
-description: Anchor High-level Overview
+description: Anchor - High-level Overview
 ---
 
 An Anchor program consists of three parts. The `program` module, the Accounts structs which are marked with `#[derive(Accounts)]`, and the `declare_id` macro. The `program` module is where you write your business logic. The Accounts structs is where you validate accounts. The`declare_id` macro creates an `ID` field that stores the address of your program. Anchor uses this hardcoded `ID` for security checks and it also allows other crates to access your program's address.

docs/src/pages/docs/installation.md

@@ -1,6 +1,6 @@
 ---
 title: Installation
-description: Quidem magni aut exercitationem maxime rerum eos.
+description: Anchor - Installation
 ---
 
 ## Rust

docs/src/pages/docs/release-notes.md

@@ -1,6 +1,6 @@
 ---
-title: Changelog
-description: Anchor - Changelog
+title: Release Notes
+description: Anchor - Release Notes
 ---
 
 Version 0 of Semantic Versioning is handled differently from version 1 and above.