MediaWiki OAuth consumer: Update instructions

Aklapper requested to merge T343579MWOAuthInstructions into wmf/stable
  • Clarify OAuth type and callback requirement to avoid error "Expected ‘oauth_callback_confirmed’ to be ‘true’!"
  • Match MediaWiki 1.41 UI terminology / strings.
  • Fix capitalization of misc strings.

Bug: T343579

Bug: T343577

Edited by Aklapper

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