Remove --module-name option from module creation code

The code presented in the docs for creating the NativeModuleSample still
had the --module-name  option, which was renamed to  --package-name  in:
brodybits/create-react-native-module#431

This commit removes this option, as the --package-name is optional and
by default the name will be set as the one used as second parameter.

docs/native-modules-setup.md

@@ -44,7 +44,7 @@ The steps to create a new native module library project are:
 Follow the official React Native instructions at https://reactnative.dev/docs/native-modules-setup.
 
 ```bat
-npx create-react-native-module --module-name "NativeModuleSample" NativeModuleSample
+npx create-react-native-module NativeModuleSample
 cd NativeModuleSample
 yarn install
 ```