PORTDOCS=*, but check-plist still complains about the doxygen directory

[Yuri]

This suggested port 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193884 has PORTDOCS=*, 
but 'make check-plist' still complains about the doxygen directory:

===> Checking for items in STAGEDIR missing from pkg-plist
Error: Orphaned: %%PORTDOCS%%@dir %%DOCSDIR%%/doxygen/d0/d02
Error: Orphaned: %%PORTDOCS%%@dir %%DOCSDIR%%/doxygen/d0/d06
Error: Orphaned: %%PORTDOCS%%@dir %%DOCSDIR%%/doxygen/d0/d09
...

...


There are several other directories, but it only complains only about 
'doxygen'.

Why is 'doxygen' special?


Yuri