Add tracking issue.

Author: ehuss

text/3389-manifest-lint.md

@@ -1,7 +1,7 @@
 - Feature Name: `manifest-lint`
 - Start Date: 2023-02-14
 - RFC PR: [rust-lang/rfcs#3389](https://github.com/rust-lang/rfcs/pull/3389)
-- Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
+- Tracking Issue: [rust-lang/cargo#12115](https://github.com/rust-lang/cargo/issues/12115)
 
 # Summary
 [summary]: #summary