Update the ParseParameters pattern documentation to allow "=" in addition to colon (:) for property value pairs

https://github.com/chocolatey/choco/wiki/How-To-Parse-PackageParameters-Argument uses colons for its sample. It should allow equals as well.

@DarwinJS mentions this makes things look inconsistent for how you pass arguments as compared to install arguments, which are typically passed with "=" in between property value pairs.