Add tests for new line doc comment

crates/teloxide/tests/command.rs

@@ -252,11 +252,15 @@ fn description_with_doc_attr() {
         Start,
         /// Help command\nwith new line
         Help,
+        /// Foo command
+        /// with new line
+        Foo,
     }
 
     assert_eq!(
         DefaultCommands::descriptions().to_string(),
-        "/start — Start command\n/help — Help command\nwith new line"
+        "/start — Start command\n/help — Help command\nwith new line\n/foo — Foo command\nwith \
+         new line"
     );
 }