Better formatting

CONTRIBUTING.md

@@ -7,17 +7,17 @@ As an open source project, Weblate welcomes contributions of many forms.
 Please report [bugs on GitHub][1]. Useful error report contains backtrace if
 possible. In production setup, admins receive it on configured email address,
 in debug mode, it is shown on screen and for management commands, you can
-obtain full backtrace using --traceback parameter.
+obtain full backtrace using ``--traceback`` parameter.
 
 Many bugs might be also caused by third party libraries, so please include
-their versions as well. You can collect all using 
+their versions as well. You can collect all using
 ``./manage.py list_versions``.
 
 [1]: https://github.com/nijel/weblate/issues/new
 
 ## Patches submission
 
-Patches are welcome either as [pull requests on GitHub][2] or using email on 
+Patches are welcome either as [pull requests on GitHub][2] or using email on
 [our mailing list][3].
 
 [2]: https://github.com/nijel/weblate/pulls