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• Updates the notes on which messages can be edited for Message.edit_*, closes Doc strings on Message.edit_ #1932
• Updates the docstring on the thumb argument of Bot.send_* and InputMedia*, closes Doc strings for Thumbs #1938
• Shortens the description of InputMedia* attributes: I.e. the limitations should be listet for the arguments, but not for the attributes
• Corrects the type statements of InputMedia.{media, thumb}: After initializing both are either string, Audio/Video/... or InputFile
• Corrects attribute docstring of Updater.user_sig_handler
• Improves rendering of CallbackContexts attributes ("Optional" goes in the description, not in the type)

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Fails unrelated, as this are only doc fixes. Merging.