[Component][Finder] Documented wildcard (glob pattern) support.

Author: jakzal

components/finder.rst

@@ -69,6 +69,15 @@ Search in several locations by chaining calls to
 
     $finder->files()->in(__DIR__)->in('/elsewhere');
 
+.. versionadded:: 2.2
+   Wildcard support was added in version 2.2.
+
+Use wildcard characters to search in the directories matching a pattern::
+
+    $finder->in('src/Symfony/*/*/Resources');
+
+Each pattern has to resolve to at least one directory path.
+
 Exclude directories from matching with the
 :method:`Symfony\\Component\\Finder\\Finder::exclude` method::