Use double quotes for pip install options (#4110)

Co-authored-by: Kayzwer <68285002+Kayzwer@users.noreply.github.com>

ultralytics/engine/exporter.py

@@ -19,7 +19,7 @@ PaddlePaddle            | `paddle`                  | yolov8n_paddle_model/
 ncnn                    | `ncnn`                    | yolov8n_ncnn_model/
 
 Requirements:
-    $ pip install ultralytics[export]
+    $ pip install "ultralytics[export]"
 
 Python:
     from ultralytics import YOLO

ultralytics/utils/tuner.py

@@ -35,7 +35,7 @@ def run_ray_tune(model,
         from ray.air.integrations.wandb import WandbLoggerCallback
         from ray.tune.schedulers import ASHAScheduler
     except ImportError:
-        raise ModuleNotFoundError("Tuning hyperparameters requires Ray Tune. Install with: pip install 'ray[tune]'")
+        raise ModuleNotFoundError('Tuning hyperparameters requires Ray Tune. Install with: pip install "ray[tune]"')
 
     try:
         import wandb