Assign #3399 to cfg-attribute-in-where

Author: recatek

text/0000-cfg-attribute-in-where.md renamed to text/3399-cfg-attribute-in-where.md

@@ -1,6 +1,6 @@
 - Feature Name: `cfg_attribute_in_where`
 - Start Date: 2023-03-11
-- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
+- RFC PR: [rust-lang/rfcs#3399](https://github.com/rust-lang/rfcs/pull/3399)
 - Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
 
 # Summary