message: Add new OsType parameters for Microsoft.Web/availablestacks
diff: "type": "string",
  "enum": [
  "Windows",
  - "Linux"
  + "Linux",
  + "WindowsFunctions",
  + "LinuxFunctions"
  ]
  },
  {
  "type": "string",
  "enum": [
  "Windows",
  - "Linux"
  + "Linux",
  + "WindowsFunctions",
  + "LinuxFunctions"
  ]
  },
  {
  