remove mention of rust issue

Author: nikomatsakis

text/2835-project-safe-transmute.md

@@ -1,7 +1,7 @@
 - Feature Name: `project-safe-transmute`
 - Start Date: 2019-12-06
 - RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
-- Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
+- Rust Issue: N/A
 
 # Summary
 [summary]: #summary
@@ -113,4 +113,4 @@ of union fields.
 [safe-transmute]: https://docs.rs/safe-transmute
 [bytemuck]: https://docs.rs/bytemuck
 [shepherd]: http://smallcultfollowing.com/babysteps/blog/2019/09/11/aic-shepherds-3-0/
-[repository]: https://github.com/rust-lang/project-safe-transmute
+[repository]: https://github.com/rust-lang/project-safe-transmute