Prepare RFC 3336 to be merged

The FCP for RFC 3336 has completed.  Let's prepare it to be merged.

Author: traviscross

text/3336-maybe-dangling.md

@@ -3,7 +3,7 @@
 - Feature Name: `maybe_dangling`
 - Start Date: 2022-09-30
 - RFC PR: [rust-lang/rfcs#3336](https://github.com/rust-lang/rfcs/pull/3336)
-- Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
+- Tracking Issue: [rust-lang/rust#118166](https://github.com/rust-lang/rust/issues/118166)
 
 # Summary
 [summary]: #summary