remove real name requirement from DCO

CONTRIBUTING.md

@@ -102,11 +102,6 @@ include the line in your commit or pull request comment:
 Signed-off-by: Your Name <your@email.example.org>
 ```
 
-We accept contributions under a legally identifiable name, such as your name on
-government documentation or common-law names (names claimed by legitimate usage
-or repute). Unfortunately, we cannot accept anonymous contributions at this
-time.
-
 Git allows you to add this signoff automatically when using the `-s` flag to
 `git commit`, which uses the name and email set in your `user.name` and
 `user.email` git configs.