message: Added missing return codes on signin doc
diff: "description": "The End-user License Agreement is mandatory"
  },
  "550": {
  - "description": "User tried to log in with an invalid user or password"
  + "description": "User tried to log into an unknown tenant, does not exists, or credentials are invalid"
  + },
  + "590": {
  + "description": "User account is locked"
  + },
  + "592": {
  + "description": "Account is pending. User must activate his account in his email"
  + },
  + "593": {
  + "description": "Account is blocked"
  + },
  + "594": {
  + "description": "Account is inactive"
  }
  }
  }
  "200": {
  "description": "Registered successfully"
  },
  - "401": {
  - "$ref": "#/components/responses/UnauthorizedError"
  - },
  "500": {
  "$ref": "#/components/responses/500BackendError"
  },
  