Add `--module` parameter to the documentation

[JezaChen]

The PyQtInspect supports running the module with parameter --module, but we lack the details in the documentation.

Example

To inspect the Eric IDE, you can run with python -m PyQtInspect --qt-support=pyqt6 --direct --module --file eric7.

[JezaChen]

When using module parameter , why still use --file? I think only one param is enough.

[JezaChen]

Defer to the version where the auto --qt-support detect feature is introduced