Remove trailing whitespace in command help's usage when the command has no arguments

src/commands/about.rs

@@ -84,7 +84,11 @@ fn get_command_help_embed(command: &Arc<dyn Command>) -> Embed {
         .collect::<Vec<_>>()
         .join(" ");
 
-    let usage = format!("{name} {arguments}");
+    let usage = if !arguments.is_empty() {
+        format!("{name} {arguments}")
+    } else {
+        name
+    };
 
     EmbedBuilder::new()
         .author(