MAINTAINERS: RFKILL - Fix pattern entry missing colon

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 223d697..887b50b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4369,7 +4369,7 @@
 M:	Johannes Berg <johannes@sipsolutions.net>
 L:	linux-wireless@vger.kernel.org
 S:	Maintained
-F	Documentation/rfkill.txt
+F:	Documentation/rfkill.txt
 F:	net/rfkill/
 
 RISCOM8 DRIVER