shorten the description

fishctl/src/command/mod.rs

@@ -23,7 +23,6 @@ struct Args {
 
     /// Specify the parent of the config directory,
     /// which typically is Firefish local repo
-    /// (default: current directory)
     #[arg(short = 'd', long, value_name = "PARENT_OF_CONFIG_DIR", global = true)]
     base_dir: Option<String>,
 }