docs: Standardize "Note" blockquote usage (#11724)

Standardize the blockquote "Notes" usage, so all places are using the
`>` blockquote notation, as well as a consistent style for the "Note"
word.

PS: Thought that bolding the word "**Note**" would make for a higher
visual distinction, so went for it in all existing cases! No strong
feelings, though; happy to roll back to just "Note:" if that's
preferrable!

Release Notes:

- N/A

docs/src/languages/javascript.md

@@ -64,10 +64,10 @@ You can also only execute a single ESLint rule when using `fixAll`:
 }
 ```
 
-**Note:** the other formatter you have configured will still run, after ESLint.
-So if your language server or prettier configuration don't format according to
-ESLint's rules, then they will overwrite what ESLint fixed and you end up with
-errors.
+> **Note:** the other formatter you have configured will still run, after ESLint.
+> So if your language server or prettier configuration don't format according to
+> ESLint's rules, then they will overwrite what ESLint fixed and you end up with
+> errors.
 
 If you **only** want to run ESLint on save, you can configure code actions as
 the formatter (requires Zed `0.130.x`):