Update revoking-access-tokens.markdown
Update revoking-access-tokens.markdown

Fixed technical errors. Authorization and Accept header information missing in examples.
HeathH-Concur/developer.concur.com,concur/developer.concur.com,concur/developer.concur.com,HeathH-Concur/developer.concur.com,sarraloew/developer.concur.com,cskelley/developer.concur.com,sarraloew/developer.concur.com,HeathH-Concur/developer.concur.com,cskelley/developer.concur.com,bhague1281/developer.concur.com,cskelley/developer.concur.com,sarraloew/developer.concur.com,HeathH-Concur/developer.concur.com,sarraloew/developer.concur.com,concur/developer.concur.com,bhague1281/developer.concur.com,bhague1281/developer.concur.com,sarraloew/developer.concur.com,concur/developer.concur.com,cskelley/developer.concur.com,concur/developer.concur.com,bhague1281/developer.concur.com,cskelley/developer.concur.com,cskelley/developer.concur.com,HeathH-Concur/developer.concur.com,bhague1281/developer.concur.com