Fix pip install typo for framegrab+youtube (#361)

Author: tyler-romero

docs/docs/getting-started/getting-started.mdx

@@ -48,7 +48,7 @@ Let's also install [framegrab](https://github.com/groundlight/framegrab) with Yo
 this useful library will let us capture frames from YouTube livestreams, webcams, and other video
 sources, making it easy to get started!
 ```bash
-pip install framegrab[youtube]
+pip install "framegrab[youtube]"
 ```
 :::tip Camera Support
 Framegrab is versatile! It works with: