Update ngx_http_map_module.xml

Author: nisbet-hubbard

xml/en/docs/http/ngx_http_map_module.xml

@@ -155,7 +155,7 @@ indicates that the variable is not cacheable (1.11.7).
 <para>
 If the source value matches more than one of the specified variants,
 e.g. both a mask and a regular expression match, the first matching
-variant will be chosen, in the following order of priority:
+variant will stop the testing, in the following order of priority:
 <list type="enum">
 
 <listitem>