Added a link to the API reference (where headers and query
strings are documented; click the "detail" button to see).
Also added a reference to Swift section of the OpenStack end
user guide. This contains some additional details about the API.
No attempt was made to reconcile duplicate information. Instead
this patch links documents that might otherwise be overlooked.
However, I fixed text, originally in a table, that had become
garbled in a prior patch.
Change-Id: I0910cbeb0c8bffc00e510f35585603e7b7a67790
b8fa480808