fix: Enter RFC number

Author: epage

text/3424-cargo-script.md

@@ -1,7 +1,7 @@
 - Feature Name: cargo-script
 - Start Date: 2023-04-26
 - Pre-RFC: [internals](https://internals.rust-lang.org/t/pre-rfc-cargo-script-for-everyone/18639)
-- eRFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
+- eRFC PR: [rust-lang/rfcs#3424](https://github.com/rust-lang/rfcs/pull/3424)
 - Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
 
 # Summary