- fix a typo

- mention the Allowoverride FileInfo in RewriteOptions' synopsis
- mention also, that pcre is used now (RewriteCond, RewriteRule)
  and set a link to perldoc.com (`perldoc perlre`)
- add compatibility note for the cookie-flag (RewriteRule)
- add RewriteMap dbm type choice compatibility note


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96796 13f79535-47bb-0310-9956-ffa450edef68