SubmittingPathces: remove Cogito reference

Removing Cogito leaves just git and StGit, which is a rather incomplete list of git diff tools available. Sidestep the problem of deciding what tools to mention by not mentioning any.

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Reading git log -p --reverse Documentation/SubmittingPatches [0] I noticed the Cogito reference was never removed. In the light of the recent discussion about removing Cogito from the GitSurvey I figured now might be a good time to remove this reference as well.

[0] https://plus.google.com/115991361267198418069/posts/NPa7vQYeMnm

 Documentation/SubmittingPatches |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

index 938eccf..0dbf2c9 100644
@@ -134,8 +134,7 @@ Another thing: NULL pointers shall be written as NULL, not as 0.
 
 (2) Generate your patch using git tools out of your commits.
 
-git based diff tools (git, Cogito, and StGIT included) generate
-unidiff which is the preferred format.
+git based diff tools generate unidiff which is the preferred format.
 
 You do not have to be afraid to use -M option to "git diff" or
 "git format-patch", if your patch involves file renames.  The

1.7.6.1.724.g9519c

Hi Sverre,

You misspelled SubmittingPatches there. Also, I feel that the subject is a little misleading. Perhaps something like this instead?
SubmittingPatches: Remove diff tool examples

Looks alright otherwise.

Thanks.

-- Ram