mod_proxy.xml: add vhost/server contextes for ProxySet
While reading PR 62422 I noticed that ProxySet's available
contextes list only 'directory', that looks odd:
AP_INIT_RAW_ARGS("ProxySet", set_proxy_param, NULL, RSRC_CONF|ACCESS_CONF
@@ -825,7 +825,8 @@ expressions</description>
<name>ProxySet</name>
<description>Set various Proxy balancer or member parameters</description>
<syntax>ProxySet <var>url</var> <var>key=value [key=value ...]</var></syntax>
-<contextlist><context>directory</context>
+<contextlist><context>server config</context><context>virtual host</context>
+<context>directory</context>
</contextlist>
<usage>
<p>This directive is used as an alternate method of setting any of the
