bug: Fix Browser documentation - browserFinished event

[livesemantics]

Bug Report

Plugin(s)

Browser

Capacitor Version

3.x.x

### Current Behavior
addListener(‘browserFinished’, …) documentation is wrong:

Android & iOS only: Listen for the loading finished event.


### Expected Behavior
Should be:

Listen for the browser closed / browser dismissed by user event.

[ionitron-bot]

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