contact: stop claiming the git mailing list is a google group

This claim is left over from the now defunct Git for Windows mailing
list, but doesn't apply to the git mailing list.

Signed-off-by: Matthias Aßhauer <mha1993@live.de>

Author: rimrul

content/contact.md

@@ -13,7 +13,7 @@ Please follow [our guide lines](./issue-reporting-guidelines.html) on reporting
 
 ## I have a question!
 
-We have [GitHub Discussions](https://github.com/git-for-windows/git/discussions/). If, for some reason or other, you prefer a mailing list, use [the Git mailing list](mailto:git@vger.kernel.org). It is actually a Google Group which can be used as if it were a forum, too.
+We have [GitHub Discussions](https://github.com/git-for-windows/git/discussions/). If, for some reason or other, you prefer a mailing list, use [the Git mailing list](mailto:git@vger.kernel.org).
 
 ## But I really have only a quick question!