This documents graceful restarts, and the caveats associated with them. The

graceful restart code itself isn't committed yet... and so this doc won't
be linked to until we commit the graceful restart code.

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Submitted by:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@77988 13f79535-47bb-0310-9956-ffa450edef68