Add description metadata to HashiCorp Vault documentation

Arpit Tripathirequested to merge
gitlab-community/gitlab-org/gitlab:525312-add-description-metadata-hashicorp-vault-docs into master

What does this MR do and why?

Add description metadata to HashiCorp Vault documentation

Related to #525312

@idurham please review it

Edited by Marcel Amirault

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