message: docs: add documentation for record.getRecordComments
diff: - [addRecords](#addRecords)
  - [updateRecords](#updateRecords)
  - [deleteRecords](#deleteRecords)
  +- [getRecordComments](#getRecordComments)
  - [createCursor](#createCursor)
  - [getRecordsByCursor](#getRecordsByCursor)
  - [deleteCursor](#deleteCursor)
  @@ -196,6 +197,41 @@ An empty object.
  - https://developer.kintone.io/hc/en-us/articles/212494558
  +### getRecordComments
  +
  +Retrieves multiple comments from a record in an app.
  +
  +#### Parameters
  +
  +| Name | Type | Required | Description |
  +| ------ | :--------------: | :------: | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  +| app | Number or String | Yes | The App ID. |
  +| record | Number or String | Yes | The Record ID. |
  +| order | String | | The sort order of the Comment ID. Specifying "asc" will sort the comments in ascending order, and "desc" will sort the comments in descending order. |
  +| offset | Number | | This skips the retrieval of the first number of comments.<br />"offset": 30 skips the first 30 comments, and retrieves from the 31st comment. There is no maximum for this value. |
  +| limit | Number | | The number of records to retrieve.<br />"limit": 5 will retrieve the first 5 comments. The default and maximum is 10 comments. |
  +
  +#### Returns
  +
  +| 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[].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. |
  +| comments[].creator.code | String | The comment creator's user code (log in name). |
  +| comments[].creator.name | String | The comment creator's user name (display name). |
  +| comments[].mentions | Array | An array including information of mentioned users. |
  +| comments[].mentions[].code | String | The code of the mentioned user, group or organization. |
  +| comments[].mentions[].type | String | The type of the mention.<br />- `USER`: User<br />- `GROUP`: Group<br />- `ORGANIZATION`: Department |
  +| older | Boolean | Information of older comments:<br />- `true`: Older comments exist.<br />- `false`: Older comments do not exist (i.e. the first comment) |
  +| newer | Boolean | Information of newer comments:<br />- `true`: Newer comments exist.<br />- `false`: Newer comments do not exist (i.e. the last comment). |
  +
  +#### Reference
  +
  +- https://developer.kintone.io/hc/en-us/articles/219105188
  +
  ### createCursor
  Adds a cursor so that large amount of records can be obtained from an App.
  