docs: mark launch app and close app as false for espresso driver

[KazuCocoa]

Proposed changes

Related to appium/appium-espresso-driver#485

Espresso driver can test only one app which is specified as capabilities.
Launch and Close app mean starting the espresso session and delete it.
Thus, in appium/appium-espresso-driver#485, I've changed to show an error message to use create/delete session instead of launch/close app. (Existed aunch/close app was broken partially, btw.)

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[coveralls]

Coverage remained the same at 89.893% when pulling ada0977 on KazuCocoa:km/make-launch-close-all-false-espresso into 15a23b8 on appium:master.