Update and rename 0000-rustdoc-scrape-examples.md to 3123-rustdoc-scrape-examples.md

Author: willcrichton

text/0000-rustdoc-scrape-examples.md renamed to text/3123-rustdoc-scrape-examples.md

@@ -1,6 +1,6 @@
 - Feature Name: `rustdoc_scrape_examples`
 - Start Date: 2021-05-09
-- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
+- RFC PR: [rust-lang/rfcs#3123](https://github.com/rust-lang/rfcs/pull/3123)
 - Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
 
 # Summary