update

Author: tgross35

library/compiler-builtins/crates/josh-sync/src/main.rs

@@ -11,7 +11,12 @@ Usage:
 
     josh-sync rustc-pull
 
+        Pull from rust-lang/rust to compiler-builtins. Creates a commit
+        updating the version file, followed by a merge commit.
+
     josh-sync rustc-push GITHUB_USERNAME [BRANCH]
+
+        Create a branch off of rust-lang/rust updating compiler-builtins.
 "#;
 
 fn main() -> anyhow::Result<()> {