docs: Fix some typos (#13509)

Minor fixes I came across while reading the docs.

Release Notes:

- N/A

CONTRIBUTING.md

@@ -41,7 +41,7 @@ We plan to set aside time each week to pair program with contributors on promisi
 
 Zed is made up of several smaller crates - let's go over those you're most likely to interact with:
 
-- [`gpui`](/crates/gpui) is a GPU-accelerated UI framework which provides all of the building blocks for Zed. **We recommend familiarizing yourself with the root level GPUI documentation**
+- [`gpui`](/crates/gpui) is a GPU-accelerated UI framework which provides all of the building blocks for Zed. **We recommend familiarizing yourself with the root level GPUI documentation.**
 - [`editor`](/crates/editor) contains the core `Editor` type that drives both the code editor and all various input fields within Zed. It also handles a display layer for LSP features such as Inlay Hints or code completions.
 - [`project`](/crates/project) manages files and navigation within the filetree. It is also Zed's side of communication with LSP.
 - [`workspace`](/crates/workspace) handles local state serialization and groups projects together.