update filename and RFC number

Author: RalfJung

text/0000-unsafe-aliased.md renamed to text/0000-unsafe-pinned.md

@@ -1,8 +1,8 @@
 # `unsafe_aliased`
 
-- Feature Name: `unsafe_aliased`
+- Feature Name: `unsafe_pinned`
 - Start Date: 2022-11-05
-- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
+- RFC PR: [rust-lang/rfcs#3467](https://github.com/rust-lang/rfcs/pull/3467)
 - Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
 
 # Summary