[clang-tools-extra] [clang-tools-extra][docs] Cover all tools in the release notes (PR #233126)

[via cfe-commits]

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@@ -124,10 +124,40 @@ infrastructure are described first, followed by tool-specific sections.
 - Added support for loading dynamic plugins via the `-load` command-line
   option.
 
+### Improvements to clang-apply-replacements
+
+### Improvements to clang-change-namespace
+
 ### Improvements to clang-doc
 
+- Fixed a crash, in builds with assertions enabled, when a documentation
+  comment contains invalid UTF-8. The text is now sanitized before it is
+  emitted.
+  ([#210675](https://github.com/llvm/llvm-project/issues/210675))
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EugeneZelenko wrote:

I don't think that issues are mentioned in this Release Notes.

https://github.com/llvm/llvm-project/pull/233126