Update help message of --hyper-v parameter in az appservice plan create to make it more intentional

Author: mstxsun

src/azure-cli/azure/cli/command_modules/appservice/_params.py

@@ -120,7 +120,7 @@ def load_arguments(self, _):
                    local_context_attribute=LocalContextAttribute(name='ase_name', actions=[LocalContextAction.GET]))
         c.argument('sku', arg_type=sku_arg_type)
         c.argument('is_linux', action='store_true', required=False, help='host web app on Linux worker')
-        c.argument('hyper_v', action='store_true', required=False, help='Host web app on Windows container')
+        c.argument('hyper_v', action='store_true', required=False, help='Host Windows Container Web App on Hyper-V worker.')
         c.argument('per_site_scaling', action='store_true', required=False, help='Enable per-app scaling at the '
                                                                                  'App Service plan level to allow for '
                                                                                  'scaling an app independently from '