wangxiyuan 2b6bc7d8b8 [api-ref] Update volume metadata key api ...

The patch did:
1. Add the missing PUT api-ref for volume metadata key.
2. fix the metadata key api's request and response example.
Correct the "metadata" with "meta".

Change-Id: I315682ef86f660eb468991a336d9edae520a4189

2017-06-19 01:28:27 +00:00

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[api-ref] Update volume metadata key api

2017-06-19 01:28:27 +00:00