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Description
Normally, links are automatically added to the "See also" section for all other pages in the same subcategory. However, this is not being done for the Serial, Stream, Keyboard, and Mouse function reference pages. Those only have links to the other pages in their subcategory when those links have been manually added.
I originally thought this was related to those pages being an extra subcategory down, but now I see that the automatically generated "See also" links work fine for the String reference pages.
Reference: