contributing: remove labelling discussion
In general contributors can't add labels to issues, so this section was
incorrect.
@@ -210,11 +210,6 @@ The [GitHub tracker][issu] is our canonical source of truth around issues,
bugs, performance problems, feature requests, and so on. If you encounter any
issues when developing on urbit, feel free to submit a report about it here.
-You should label your issue appropriately if you know happen to know what it
-applies to. For example, a `%gall` bug should be labelled with both 'gall' and
-'bug'. It's ok if you don't know how to label your issue -- the maintainers
-will help you out and try to label it appropriately.
-
A good bug report, description of a crash, etc., should ideally be
*reproducible*, with clear, obvious steps as to how another developer can
replicate and examine your problem. That said, this isn't always possible --
