[Docs]Adds 7.10 detection rule updates to API docs (#270)

* adds eql rule to api docs

* starts adding threat match rule type

* threat-match cont

* adds threat-match rule response

* update rule api chnages

* proofing

* Update docs/detections/api/rules/rules-api-create.asciidoc

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* Update docs/detections/api/rules/rules-api-create.asciidoc

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Author: benskelker