[TIDOC-671] Added info about handling application restarts.

Also added "ti.android.root.reappears.restart" to "Android-specific Properties" section of tiapp.xml reference
https://wiki.appcelerator.org/display/guides2/tiapp.xml+and+timodule.xml+Reference#tiapp.xmlandtimodule.xmlReference-Android-specificapplicationproperties
Either need a comma after the parenthesis or move 'Android' before 'kills'