Backport of [docs] fix lack of space character into release/1.15.x

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

Backport

This PR is auto-generated from #26830 to be assessed for backporting due to the inclusion of the label backport/1.15.x.

🚨

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:
@schavis
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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https://developer.hashicorp.com/vault/docs/concepts/policies#ui-policy-requirements

to the ui/mountsand ui/resultant-acl

needs a space after mounts

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Overview of commits

• 0a54c62

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[hashicorp-cla-app]

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[github-actions]

CI Results:
All Go tests succeeded! ✅

[stevendpclark]

Closing was fixed in #26995