Add tracking issue for RFC 3453

Author: traviscross

text/3453-f16-and-f128.md

@@ -1,7 +1,7 @@
 - Feature Name: `f16_and_f128`
 - Start Date: 2023-07-02
 - RFC PR: [rust-lang/rfcs#3453](https://github.com/rust-lang/rfcs/pull/3453)
-- Rust Issue: [rust-lang/rfcs#2629](https://github.com/rust-lang/rfcs/issues/2629)
+- Tracking Issue: [rust-lang/rust#116909](https://github.com/rust-lang/rust/issues/116909)
 
 # Summary
 [summary]: #summary