Update Compute Diagnostic RP swagger doc API version to 2021-06-01-preview#28354

Elina-L wants to merge 4 commits intoAzure:mainAzure/azure-rest-api-specs:mainfrom

Elina-L:wenxliu/SpotPlacementRecommenderAPIVersion2021-06-01-previewElina-L/azure-rest-api-specs:wenxliu/SpotPlacementRecommenderAPIVersion2021-06-01-previewCopy head branch name to clipboard