[Chore] Update cli.py to add some comments

Add some comments to explain the feature flag of `--enable-quick-look-share` implemented by #889 

Signed-off-by: Kent Huang <kent@infuseai.io>

piperider_cli/cli.py

@@ -69,6 +69,10 @@ def dbt_select_option_builder():
 ]
 
 feature_flags = [
+    # Quick Look (https://cloud.piperider.io/quick-look) is a public-facing page on PipeRider Cloud.
+    # Every user can paste the GitHub repo or PR URL, and PipeRider Cloud will analyze that URL by the CLI on the air.
+    # The reports on the Quick Look are default shared public with a limited time.
+    # PipeRider Cloud uses this feature flag to upload those reports to the Quick Look storage.
     click.option('--enable-quick-look-share', envvar='PIPERIDER_ENABLE_QUICK_LOOK_SHARE',
                  is_flag=True, default=False, hidden=True, help='Enable share to Quick Look.')
 ]