Change GpgKeyInput in REST API docs to GpgKeysInput
Change GpgKeyInput in REST API docs to GpgKeysInput

This matches the class name used in client code, and indicates that
the input may consist of multiple keys.

Change-Id: I9e71a84dd053a3fa5f20f5b488baa2e34d70c57f

pkdevbox/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,pkdevbox/gerrit,Seinlin/gerrit,quyixia/gerrit,Seinlin/gerrit,Seinlin/gerrit,GerritCodeReview/gerrit,netroby/gerrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,netroby/gerrit,gerrit-review/gerrit,supriyantomaftuh/gerrit,renchaorevee/gerrit,quyixia/gerrit,netroby/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,netroby/gerrit,MerritCR/merrit,gerrit-review/gerrit,WANdisco/gerrit,quyixia/gerrit,Seinlin/gerrit,WANdisco/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,joshuawilson/merrit,renchaorevee/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,joshuawilson/merrit,WANdisco/gerrit,Seinlin/gerrit,renchaorevee/gerrit,MerritCR/merrit,Seinlin/gerrit,GerritCodeReview/gerrit,supriyantomaftuh/gerrit,WANdisco/gerrit,supriyantomaftuh/gerrit,qtproject/qtqa-gerrit,quyixia/gerrit,joshuawilson/merrit,MerritCR/merrit,netroby/gerrit,pkdevbox/gerrit,MerritCR/merrit,joshuawilson/merrit,supriyantomaftuh/gerrit,renchaorevee/gerrit,netroby/gerrit,MerritCR/merrit,joshuawilson/merrit,supriyantomaftuh/gerrit,Seinlin/gerrit,supriyantomaftuh/gerrit,joshuawilson/merrit,pkdevbox/gerrit,gerrit-review/gerrit,WANdisco/gerrit,pkdevbox/gerrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,supriyantomaftuh/gerrit,MerritCR/merrit,joshuawilson/merrit,quyixia/gerrit,WANdisco/gerrit,quyixia/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,pkdevbox/gerrit,GerritCodeReview/gerrit,renchaorevee/gerrit,quyixia/gerrit,renchaorevee/gerrit,pkdevbox/gerrit,MerritCR/merrit,netroby/gerrit,renchaorevee/gerrit,joshuawilson/merrit