ctucx.git: stagit

stagit.1: also document linking to git submodules: .gitmodules file

diff --git a/stagit.1 b/stagit.1
@@ -70,8 +70,8 @@ owner of repository
 primary clone url of the repository, for example: git://git.2f30.org/stagit
 .El
 .Pp
-When the files README or LICENSE exist in HEAD, a direct link in the menu is
-made.
+When a README or LICENSE file exists in HEAD or a .gitmodules submodules file
+exists in HEAD a direct link in the menu is made.
 .Pp
 For changing the style of the page you can use the following files:
 .Bl -tag -width Ds