dispatcher: docs for reload_delta parameter

- GH #1939

src/modules/dispatcher/doc/dispatcher_admin.xml

@@ -1009,6 +1009,32 @@ modparam("dispatcher", "ds_db_extra_attrs", "socket=socket;pref=prefix")
  		</example>
 	</section>
 
+	<section id="dispatcher.p.reload_delta">
+		<title><varname>reload_delta</varname> (int)</title>
+		<para>
+		The number of seconds that have to be waited before executing a new reload
+		of dispatcher records. By default there is a rate limiting of maximum
+		one reload in five seconds.
+		</para>
+		<para>
+		If set to 0, no rate limit is configured. Note carefully: use this
+		configuration only in tests environments because executing many RPC
+		reload commandss at the same time can cause unexpected behavior.
+		</para>
+		<para>
+		<emphasis>
+			Default value is <quote>5</quote>.
+		</emphasis>
+		</para>
+		<example>
+		<title>Set <varname>reload_delta</varname> parameter</title>
+		<programlisting format="linespecific">
+...
+modparam("dispatcher", "reload_delta", 1)
+...
+		</programlisting>
+		</example>
+	</section>
 	</section>
 
 	<section>