(📚) create a new merge request thread incorrectly says that the `position` fields are required

Problem to solve

From: https://docs.gitlab.com/ee/api/discussions.html#create-new-merge-request-thread

Attribute: position[base_sha]
Type: string
Required: yes

But then right below it: https://docs.gitlab.com/ee/api/discussions.html#create-a-new-thread-on-the-overview-page

None of these required fields are specified.

Other links/references

It seems that the GraphQL API was based on this error:

#393501 (closed)