docs: s/subcommand/command/ to match generated --help

Author: ErichDonGubler

src/main.rs

@@ -6,7 +6,7 @@ use git_glimpse::{git_config, list_branches_cmd, run, show_graph, stdout_lines};
 
 /// Show a minimal graph of Git commits for various use cases.
 ///
-/// When no arguments are specified, this commands runs as if the `stack` subcommand was invoked
+/// When no arguments are specified, this commands runs as if the `stack` command was invoked
 /// with no arguments.
 #[derive(Debug, Parser)]
 struct Args {