[Conduct] Refine what "rare cases" means wrt violations outside our spaces.

[probinson]

Summary

Additional text suggested by Daniel Berlin. While it is likely to be exactly what the advisory committee would do anyway, it does no harm to say so here and helps reassure some people that rarity is not arbitrary.

[rengolin]

As I said in the thread, LGTM, but wait for Chandler's and Daniel's feedback, too.

[• dberlin]

LGTM

docs/CodeOfConduct.rst

 
 This code of conduct applies to all spaces managed by the LLVM project or The
 LLVM Foundation. This includes IRC channels, mailing lists, bug trackers, LLVM
 events such as the developer meetings and socials, and any other forums created
 by the project that the community uses for communication. It applies to all of
 your communication and conduct in these spaces, including emails, chats, things
 you say, slides, videos, posters, signs, or even t-shirts you display in these
 spaces. In addition, violations of this code outside these spaces may, in rare
-cases, affect a person's ability to participate within them.
+cases, affect a person's ability to participate within them, when the conduct
+amounts to an egregious violation of this code.
 
 If you believe someone is violating the code of conduct, we ask that you report
 it by emailing [e-mail]. For more details please see our
 :doc:`Reporting Guide <ReportingGuide>`.
 
 .. _be friendly and patient:
 
 * **Be friendly and patient.**