[docs] [issue41283] The parameter name for imghdr.what in the documentation is wrong

Change by Ammar Askar ammar@ammaraskar.com:

---------- keywords: +patch nosy: +ammar2 nosy_count: 2.0 -> 3.0 pull_requests: +20642 stage: -> patch review pull_request: https://github.com/python/cpython/pull/21501

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