Typo in new DeploymentStackWhatIfResult cmdlets

**Describe the bug**
The parameter DenySettingsApplyToChildScope should be DenySettingsApplyToChildScopes. That is how it is no any other cmdlets for deploying stacks.

**To Reproduce**
Just check https://learn.microsoft.com/en-us/powershell/module/az.resources/new-azmanagementgroupdeploymentstackwhatifresult?view=azps-16.2.0#-managementgroupid and https://learn.microsoft.com/en-us/powershell/module/az.resources/new-azmanagementgroupdeploymentstack?view=azps-16.2.0#-denysettingsapplytochildscopes

**Expected behavior**
To be renamed to DenySettingsApplyToChildScopes

**Additional context**
Add any other context about the problem here.