Variable names in sample appium.txt file for Android updated

arc setup android command creates sample appium.txt file but the variable names inside are different than it is referred at https://saucelabs.com/resources/appium-bootcamp/appium-bootcamp-2013-chapter-2-the-console

Looking at source code I see that we are trying to print to file what users have in their environment variables. I think it would be more helpful if we format it like this. They can just update appium.txt file and use it.