Add API documentation for the inclusion of a webhook Authorization header.
Add API documentation for the inclusion of a webhook Authorization header.

dstrctrng/private_event,square/rubygems.org,rubygems/rubygems.org-backup,rubygems/rubygems.org-backup,1337807/rubygems.org,bpm/getbpm.org,rubygems/rubygems.org-backup,square/rubygems.org,1337807/rubygems.org,1337807/rubygems.org,dstrctrng/private_event,bpm/getbpm.org,square/rubygems.org