message: docs(api): fix set-cookie -> cookie
diff: @@ -320,7 +320,7 @@ Get new refresh token. The browser will send the cookie automatically.
  ```
  Cookie: refresh_token=...
  -Set-Cookie: permission_variables=...
  +Cookie: permission_variables=...
  ```
  #### Response
  @@ -349,7 +349,7 @@ Revoke a refresh token.
  ```
  Cookie: refresh_token=...
  -Set-Cookie: permission_variables=...
  +Cookie: permission_variables=...
  ```
  #### Response
  