dispatcher: small docs extension, algo 3 hashes only over r-uri user (DS_HASH_USER_ONLY 1)

(cherry picked from commit 0f633c0def3759078fea427597190fab196c89bd)

src/modules/dispatcher/doc/dispatcher_admin.xml

@@ -1150,7 +1150,7 @@ modparam("dispatcher", "reload_delta", 1)
 			</listitem>
 			<listitem>
 				<para>
-				<quote>3</quote> - hash over request-URI.
+				<quote>3</quote> - hash over request-URI user.
 				</para>
 			</listitem>
 			<listitem>