Backport of Add missing allowed_managed_keys param to mount creation doc into release/1.10.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #23948 to be assessed for backporting due to the inclusion of the label backport/1.10.x.

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Warning automatic cherry-pick of commits failed. If the first commit failed,
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The person who merged in the original PR is:
@stevendpclark
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/vault/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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• We had updated the mount tune api, but missed it within the creation api docs

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Overview of commits

• 750ab33

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[stevendpclark]

Closing PR, not worth the effort to fix docs that didn't merge.