docs(bin): update the doc comment for completions script

git-cliff/src/bin/completions.rs

@@ -8,7 +8,7 @@ use structopt::StructOpt;
 
 /// Shell completions can be created with `cargo run --bin completions`
 /// in a directory specified by the environment variable OUT_DIR.
-/// See https://doc.rust-lang.org/cargo/reference/environment-variables.html
+/// See <https://doc.rust-lang.org/cargo/reference/environment-variables.html>
 fn main() {
 	let out_dir = env::var("OUT_DIR").expect("OUT_DIR is not set");
 	let mut app = Opt::clap();