Commit a445cb92 removed the default file
names for server-side CRL and CA files, but left them in the docs with a
small note.  This removes the note and the previous default names to
clarify, as well as changes mentions of the file names to make it
clearer that they are configurable.

Author: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>