Add missing closing backtick in commit hook message 🐸

Author: yotamofek

Diff for: src/bootstrap/src/core/build_steps/format.rs

@@ -116,7 +116,7 @@ fn print_paths(verb: &str, adjective: Option<&str>, paths: &[String]) {
         println!("fmt: {verb} {len} {adjective}files");
     }
     if len > 1000 && !CiEnv::is_ci() {
-        println!("hint: if this number seems too high, try running `git fetch origin master");
+        println!("hint: if this number seems too high, try running `git fetch origin master`");
     }
 }