Fix awkward grammar in some of mod_ssl's error messages.

Submitted by:	Ryan Morgan <rmorgan@covalent.net>
Reviewed by:	Aaron Bannert


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92229 13f79535-47bb-0310-9956-ffa450edef68