Fix outdated comments in catcache.h

[cca5507]

Hi,

473182c9523afad10e9507145690d902a0bc7f04 add a hash table for CatCList, this has
made some comments outdated.

Attach a small patch to fix it.

--
Regards,
ChangAo Chen

v1-0001-Fix-outdated-comments-in-catcache.h.patch
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