A little more cleanup of win_service and windows .html docs.

  Covered the Log On As... option just a little better, with some hints.

  Dire warnings about Win95/98 at the end of the services section.

  Roll back Win95/98 services directives, and just point out differences.

  Get rid of the silly word 'signalling' - which means squat to your
  typical Win32 user!

  Anything else anyone can think of to cover?

PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@85508 13f79535-47bb-0310-9956-ffa450edef68