Update Project API documentation to support sha256 object format

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The following discussion from !137659 (merged) should be addressed:

• @msedlakjakubowski started a discussion:

Task

We should update the documentation to mention SHA256 support of Projects creation API.

This feature is currently released behind the feature flag support_sha256_repositories: #431864.

It's blocked by [Feature flag] Rollout of `support_sha256_repos... (#431864).