httpd.conf (for old apache). Simple 2line comment addition to localconfig
to inform the user they may need to look at access.conf in addition to
httpd.conf if they are using an older version of apache.

Patch by Gavin Shelley <gavins@iplbath.com> r=Zach Lipton
<zach@zachlipton.com> no 2nd review needed for this patch.