[Doc] Update docs to mention format prop for timezone adjustment

[ogroppo]

Problem

Problem is described here, there is no way to manipulate the value coming from dataprovider because it will always win

Solution

use format prop

How To Test

Tested on storybook

Additional Checks

• The PR targets master for a bugfix
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

Also, please make sure to read the contributing guidelines.

[ogroppo]

updated to be a doc change only, thanks.

[djhi]

Thanks!