fix: small fixes to diff viewer page (#566)

Author: jpenilla

docs/misc/tools/diff-viewer.mdx

@@ -7,8 +7,8 @@ description: Multi-file rich diff viewer for GitHub and diff/patch files.
 
 Multi-file rich diff viewer with support for GitHub commits, PRs, and comparisons, as well as
 diff and patch files.
-The GitHub diff viewer is a great tool for most uses cases, but it has a variety of limitations,
-especially when dealing with large diffs where the viewer will perform poorly or even crash. The
+The GitHub diff viewer is a great tool for most use cases, but it has a variety of limitations,
+especially when dealing with large diffs where the viewer will perform poorly or even crash.
 Patch Roulette Diff Viewer aims to solve this problem while also providing a variety of additional
 features useful for PaperMC and generally, such as special handling for second-order diffs. We have
 also built a browser extension for Firefox and Chrome to streamline opening GitHub diffs in the