Rollup merge of rust-lang#48705 - klnusbaum:update_rfc_process, r=aturon

Update Feature Request instructions

As noted in rust-lang#48393 the contribution instructions for submitting a Feature Request are a little hasty, suggesting that the user immediately create an issue in the RFC repository. For users that want to submit a feature request, let's instead point them directly to the README file for the RFC repository, which contains detailed instructions on how to submit a Feature Request.

CONTRIBUTING.md

@@ -26,10 +26,10 @@ As a reminder, all contributors are expected to follow our [Code of Conduct][coc
 ## Feature Requests
 [feature-requests]: #feature-requests
 
-To request a change to the way that the Rust language works, please open an
-issue in the [RFCs repository](https://github.com/rust-lang/rfcs/issues/new)
-rather than this one. New features and other significant language changes
-must go through the RFC process.
+To request a change to the way the Rust language works, please head over
+to the [RFCs repository](https://github.com/rust-lang/rfcs) and view the 
+[README](https://github.com/rust-lang/rfcs/blob/master/README.md)
+for instructions.
 
 ## Bug Reports
 [bug-reports]: #bug-reports