Update doc for the SIGUSR1 change - we no longer use SIGWINCH except on

Linux 2.0/glibc 2.0 which doesn't allow SIGUSR1 to be used by programs.

Feel free to change the wording.  I don't care.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@91091 13f79535-47bb-0310-9956-ffa450edef68