Add CategoryAPICategory to the complete API index

build-scripts/wikiheaders.pl

@@ -2627,6 +2627,12 @@ if ($copy_direction == 1) {  # --copy-to-headers
 
 <!-- END CATEGORY DOCUMENTATION -->
 
+## Categories
+
+<!-- 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: Category$cat, CategoryAPICategory -->
+<!-- END CATEGORY LIST -->
+
 ## Functions
 
 <!-- DO NOT HAND-EDIT CATEGORY LISTS, THEY ARE AUTOGENERATED AND WILL BE OVERWRITTEN, BASED ON TAGS IN INDIVIDUAL PAGE FOOTERS. EDIT THOSE INSTEAD. -->