hashicorp_vault: changes for unified integration UI

[endorama]

What does this PR do?

Align package title and description for improved Unified Integration UI display.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.13.0).

Author's Checklist

• promote package to staging
• promote package to production

How to test this PR locally

Related issues

• Part of Update title and description based on guidelines for Elastic Agent based Observability integrations #1901

Screenshots

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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Build stats

• Start Time: 2021-11-08T14:29:39.827+0000

• Duration: 17 min 3 sec

• Commit: 75cadd8

Test stats 🧪

Test	Results
Failed	0
Passed	18
Skipped	0
Total	18

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