Fix API documentation, to correct misleading HTTP_AUTHORIZATION statement.

[johnbywater]

Sean Burlington wrote:

I recently came across a documentation issue

​http://knowledgeforge.net/ckan/doc/ckan/api.html

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The key should be passed in the API request header: Header Example value HTTP_AUTHORIZATION fde34a3c-b716-4c39-8dc4-881ba115c6d4

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But the header name is actually just 'AUTHORIZATION'

For example to set it in PHP

curl_setopt($ch, CURLOPT_HTTPHEADER, array('AUTHORIZATION: xxxxx-xxxx-xxxx-xxxx-xxxxxxx'));