message: [LabServices] Fix typo, remove required from optional param
diff: "type": "string"
  },
  {
  - "name": "personalPerferencesOperationsPayload",
  + "name": "personalPreferencesOperationsPayload",
  "in": "body",
  "description": "Represents payload for any Environment operations like get, start, stop, connect",
  "required": true,
  - "schema": { "$ref": "#/definitions/PersonalPerferencesOperationsPayload" }
  + "schema": { "$ref": "#/definitions/PersonalPreferencesOperationsPayload" }
  },
  { "$ref": "#/parameters/api-version" }
  ],
  },
  "Environment": {
  "description": "Represents an environment instance",
  - "required": [ "properties" ],
  "type": "object",
  "allOf": [ { "$ref": "#/definitions/Resource" } ],
  "properties": {
  },
  "EnvironmentSetting": {
  "description": "Represents settings of an environment, from which environment instances would be created",
  - "required": [ "properties" ],
  "type": "object",
  "allOf": [ { "$ref": "#/definitions/Resource" } ],
  "properties": {
  }
  }
  },
  - "PersonalPerferencesOperationsPayload": {
  + "PersonalPreferencesOperationsPayload": {
  "description": "Represents payload for any Environment operations like get, start, stop, connect",
  "type": "object",
  "properties": {
  