rename to rfcs#3838

Author: davidtwco

text/0000-repr-scalable.md renamed to text/3838-repr-scalable.md

@@ -1,6 +1,6 @@
 - Feature Name: `repr_scalable`
 - Start Date: 2025-07-07
-- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
+- RFC PR: [rust-lang/rfcs#3838](https://github.com/rust-lang/rfcs/pull/3838)
 - Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
 
 # Summary