Fix typos and grammatical mistakes in docs (#59495)

# Objective

- Describe the objective or issue this PR addresses. -> ** Typo and
grammar fixes!**

## Solution


## Testing

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

## Showcase

---

Release Notes:

- N/A

docs/src/languages/cpp.md

@@ -176,7 +176,7 @@ Automatically dims inactive sections of code due to preprocessor directives, suc
 
 ### Switch Between Source and Header Files
 
-Allows switching between corresponding C++ source files (e.g., `.cpp`) and header files (e.g., `.h`).
+Allows switching between corresponding C++ source files (e.g., `.cpp`) and header files (e.g., `.h`)
 by running the command {#action editor::SwitchSourceHeader} from the command palette or by setting
 a keybinding for the `editor::SwitchSourceHeader` action.