docs: Improve useWindowDimensions documentation example

[simbolmina]

• Enhanced the example to demonstrate how to dynamically adjust UI element sizes based on font scale.
• Updated the description of fontScale to emphasize its use in making UI elements adaptable to font size changes, ensuring better readability and usability.

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[Simek]

Closing as duplicate of:

• docs: Improve useWindowDimensions documentation example #4142