[clang-doc][NFC] Add TODO for future work (#138052)

diff --git a/clang-tools-extra/clang-doc/Representation.h b/clang-tools-extra/clang-doc/Representation.h
index 1d5c4dc..a2f8701 100644
--- a/clang-tools-extra/clang-doc/Representation.h
+++ b/clang-tools-extra/clang-doc/Representation.h
@@ -60,6 +60,7 @@
   // the vector.
   bool operator<(const CommentInfo &Other) const;
 
+  // TODO: The Kind field should be an enum, so we can switch on it easily.
   SmallString<16>
       Kind; // Kind of comment (FullComment, ParagraphComment, TextComment,
             // InlineCommandComment, HTMLStartTagComment, HTMLEndTagComment,