[Docs] Fix the incorrect parameter in checkpoint docs

[GukjinHan]

Describe the bug
There is a minor issue in the page describing Checkpoint:
In the Checkpoint signature, there is a wrong parameter (&42;)

To Reproduce
Steps to reproduce the behavior:
Go to docs page : https://docs.greatexpectations.io/docs/reference/api/Checkpoint_class

Expected behavior
Fix the incorrect parameter

Environment (please complete the following information):

N/A

[adeola-ak]

hey, thanks for reporting this! We will make the necessary update

[anshulsingh-py]

Hi @adeola-ak can I take this task.

[adeola-ak]

Hi @anshulsingh-py, I believe this fix is already being worked on internally—thank you! That said, we always encourage contributions from our community. Here are our guidelines for contributing in the future. Feel free to ping me once you’ve created a PR to help expedite the process.