Sync SDL3 wiki -> header

docs/README-CategoryStuff.md

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+# CategoryStuff
+
+<!-- DO NOT HAND-EDIT CATEGORY LISTS, THEY ARE AUTOGENERATED AND WILL BE OVERWRITTEN, BASED ON TAGS IN INDIVIDUAL PAGE FOOTERS. EDIT THOSE INSTEAD. -->
+<!-- BEGIN CATEGORY LIST -->
+- [documentation-rules](documentation-rules)
+<!-- END CATEGORY LIST -->
+

docs/README-CategoryWhatever.md

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+# CategoryWhatever
+
+<!-- DO NOT HAND-EDIT CATEGORY LISTS, THEY ARE AUTOGENERATED AND WILL BE OVERWRITTEN, BASED ON TAGS IN INDIVIDUAL PAGE FOOTERS. EDIT THOSE INSTEAD. -->
+<!-- BEGIN CATEGORY LIST -->
+- [documentation-rules](documentation-rules)
+<!-- END CATEGORY LIST -->
+