[DOCUMENTATION] Information on obtaining the json in opensearch_dashboard_object body

[fajoweianfkl]

Given that OpenSearch exports dashboards as .ndjsons that are not the same as the JSON required by opensearch_dashboard_object, it would be helpful to add a description of where the provided JSON structures come from. An example GET request would be helpful, too, such as

GET /.kibana*/_search { "size": 1000, "query": { "term": { "type": "dashboard" } } }

or

GET /.kibana*/_search { "size": 1000, "query": { "term": { "type": "visualization" } } }

And an explanation of what is happening with the "hits" array from the result.

[krisfreedain]

@peterzhuamazon @prudhvigodithi @jackson-theisen @PhilippReinke @rblcoder - can you take a look at this?

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