[image_picker] Update documentation of maxDuration to reflect that it only applies to recording

[AbdeMohlbi]

Fixes flutter/flutter#83630

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[gemini-code-assist]

Code Review

This pull request updates the image_picker package to version 1.2.2 and clarifies that the maxDuration parameter applies only to video recording from the camera, not gallery selection. Feedback was provided to correct minor grammatical and spacing issues in the documentation update for maxDuration.

[AbdeMohlbi]

test exemption : this is a documentation change and does not affect the behavior of image_picker