Minor user route changes

src/routes/user.js

 const router = new express.Router()
 const app = express()
 
+/**
+ * @openapi
+ * /users/:
+ *   get:
+ *     description: Get all users
+ *     tags: [User]
+ *     responses:
+ *       200:
+ *         description: Success!
+ *       400:
+ *         description: Bad request.
+ *       500:
+ *         description: Internal server error.
+ */
 router.get('/users', endpoints.getUsers)
 
 /**
  *       200:
  *         description: Success!
  *       400:
- *         description: You sent bad request.
+ *         description: Bad request.
  *       500:
  *         description: Internal server error.
  */
  *       201:
  *         description: User successfully created!
  *       400:
- *         description: You sent bad request.
+ *         description: Bad request.
  *       500:
  *         description: Internal server error.
  */