message: docs: fix the return type of `getRecordComments`
diff: @@ -218,7 +218,7 @@ Retrieves multiple comments from a record in an app.
  | Name | Type | Description |
  | -------------------------- | :-----: | ---------------------------------------------------------------------------------------------------------------------------------------- |
  | comments | Array | An array of comments. An empty array is returned if no conditions are met. |
  -| comments[].id | Number | The Comment ID. |
  +| comments[].id | String | The Comment ID. |
  | comments[].text | String | The comment including the line feed codes.<br />If a user is mentioned within a comment, the "@" symbol will be omitted from the String. |
  | comments[].createdAt | String | The created date and time of the comment. |
  | comments[].creator | Object | An object including information of the comment creator. |
  