message: Simplify Azure regions reference
diff: "hostTemplate": "{azureRegion}.api.cognitive.microsoft.com",
  "parameters": [
  {
  - "$ref": "#/parameters/AzureRegion"
  + "$ref": "../../Common/Parameters.json#/parameters/AzureRegion"
  }
  ]
  },
  - "parameters": {
  - "AzureRegion": {
  - "name": "azureRegion",
  - "description": "Supported Azure regions for Entity Search endpoints",
  - "x-ms-parameter-location": "client",
  - "required": true,
  - "type": "string",
  - "in": "path",
  - "x-ms-skip-url-encoding": true,
  - "x-ms-enum": {
  - "name": "AzureRegion",
  - "modelAsString": true
  - },
  - "enum": [
  - "westus",
  - "westeurope",
  - "southeastasia",
  - "eastus2",
  - "westcentralus"
  - ]
  - }
  - },
  "schemes": [
  "https"
  ],
  