Update extending activity docs

[manojdcoder]

Please, tell us what's the problem?

Improvement of existing article

Please, tell us more details

1. Since we have replaced android.app.Activity with android.support.v7.app.AppCompatActivity, docs should reflect the same.
2. isNativeScriptActivity flag is used to identify whether or not to trigger application level resume event, since it's not documented we loose resumeEvent when extending own activity.

[NickIliev]

@manojdcoder thank you for reporting this one! The android.support.v7.app.AppCompatActivity was already added but we've missed the new boolean flag in the examples. Added via the PRs described below.

Resolved via https://github.com/NativeScript/docs/pull/1420 and via NativeScript/nativescript-dev-webpack#705

[lock]

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