gittutorial: drop early mention of origin

We don't have an origin at this point in the tutorial, so "Your branch
is up to date" won't actually show up in the output of `git status`.

This line was introduced in 8942821 ("gittutorial: fix output of 'git
status'", 2014-11-13) in what looks like a mistake -- that commit mostly
just wanted to remove leading '#' characters.

Signed-off-by: Martin Ågren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Martin Ågren

Documentation/gittutorial.txt

@@ -109,7 +109,6 @@ summary of the situation with 'git status':
 $ git status
 On branch master
 Changes to be committed:
-Your branch is up to date with 'origin/master'.
   (use "git restore --staged <file>..." to unstage)
 
 	modified:   file1