RFC 2965 is "Establish a new error handling project group"

Author: Amanieu

text/0000-project-error-handling.md renamed to text/2965-project-error-handling.md

@@ -1,7 +1,7 @@
 - Feature Name: error_handling_project_group
 - Start Date: 2020-07-23
-- RFC PR: [rust-lang/rfcs#0000](https://github.com/rust-lang/rfcs/pull/0000)
-- Rust Issue: [rust-lang/rust#0000](https://github.com/rust-lang/rust/issues/0000)
+- RFC PR: [rust-lang/rfcs#2965](https://github.com/rust-lang/rfcs/pull/2965)
+- Rust Issue: [rust-lang/libs-team#3](https://github.com/rust-lang/libs-team/issues/3)
 
 # Summary
 [summary]: #summary