Refactor: libcrmcommon: Drop confusing comments from results_internal.h

I see what I was *trying* to do with these comments: create new sections
for things relating to multiple result types and to standard Pacemaker
return codes. However, I just spent about 10 minutes trying to figure
out what the heck these comments mean, and I wrote them. Better to drop.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>