Simplify gulpfile help section and add --debug argument (#1931)
Simplify gulpfile help section and add --debug argument (#1931)

* Simplify gulpfile help section and add --debug argument

* Small help text correction

hovsepm/azure-sdk-for-java,navalev/azure-sdk-for-java,navalev/azure-sdk-for-java,Azure/azure-sdk-for-java,selvasingh/azure-sdk-for-java,martinsawicki/azure-sdk-for-java,Azure/azure-sdk-for-java,hovsepm/azure-sdk-for-java,martinsawicki/azure-sdk-for-java,Azure/azure-sdk-for-java,martinsawicki/azure-sdk-for-java,hovsepm/azure-sdk-for-java,Azure/azure-sdk-for-java,Azure/azure-sdk-for-java,navalev/azure-sdk-for-java,selvasingh/azure-sdk-for-java,selvasingh/azure-sdk-for-java,navalev/azure-sdk-for-java,navalev/azure-sdk-for-java,hovsepm/azure-sdk-for-java,hovsepm/azure-sdk-for-java