fix example in man page

doc/bugs/git_annex_content_fails_with_a_parse_error.txt

@@ -28,3 +28,5 @@ git-annex version: 4.20130709.1, ubuntu quantal
 
 # End of transcript or log.
 """]]
+
+> Fixed the example, thanks. --[[Joey]] [[done]]

doc/git-annex.mdwn

@@ -322,7 +322,7 @@ subdirectories).
 
   For example:
 
-	git annex content . "include(*.mp3) or include(*.ogg)"
+	git annex content . "include=*.mp3 or include=*.ogg"
 
   Without an expression, displays the current preferred content setting
   of the repository.