Modify focus events for TextBox B

[WillEhrendreich]

Updated focus handling for TextBox B to set focus state. it's a 2 character documentation change that doesn't have any tests associated with it, most likely, won't affect builds, etc. I don't see an advantage of going through the ceremony of the checklist items, as if it were a real code change.

[Copilot]

Pull request overview

Updates the “Managing Focus” documentation snippet to correctly track focus state for TextBox B (previously, TextBox B focus events were updating the TextBox A focus state).

Changes:

• Fix TextBox B’s onGotFocus handler to set textBoxBFocus
• Fix TextBox B’s onLostFocus handler to set textBoxBFocus

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