James Rodewig e1726fff56 [DOCS] Reformat update license API docs (#48967)
Makes a few changes to better align the update license API docs with
the [API reference template][0].

Changes:

* Replaces POST with PUT in several snippet examples.
  While both are valid, PUT is a bit more RESTful.

* Removes leading slashes (/) from all snippets.

* Relocates and retitles the 'Authorization' section to 'Prerequisites'.

* Replaces explicit titles with the appropriate API reference template
  attributes.

* Replaces unneeded `[float]` tags with explicit anchors.

Closes #35341

[0]: https://github.com/elastic/docs/blob/master/shared/api-ref-ex.asciidoc
2019-11-14 08:00:42 -05:00
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