Docs pages optionalIsInput broken markup

[unawarez]

• I have checked that the [SDK documentation][sdk-docs] doesn't solve my issue.
• I have checked that the [API documentation][api-docs] doesn't solve my issue.
• I have searched the [Box Developer Forums][dev-forums] and my issue isn't already reported (or if it has been reported, I have attached a link to it, for reference).
• I have searched [Issues in this repo][github-repo] and my issue isn't already reported.

Description of the Issue

It seems all the docs pages have this same issue for each function with the markup generated for optionalIsInput becoming a header, for example https://github.com/box/box-typescript-sdk-gen/blob/main/docs/fileMetadata.md#optionalsinput-getfilemetadataoptionalsinput

Screenshot:

[arjankowski]

Thanks @unawarez for reporting the issue.
We've already fixed it in this PR #672

Regards,
Artur