APPTS v13.18.1 release note

[pkclark]

Thank you for your contribution to the Platform-Management-Docs repo.

Describe the changes

Can you believe it.... it's a timely PR for the APPTS v13.18.1 release note.

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• You have signed the Axway CLA
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Put an x in the boxes that apply. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your change.

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• Does not have conflicts with the base branch
• Is clear and complete
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• Follows Axway style
• Does not contain typos, grammatical errors, etc.
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• Passes the Markdown linter rules (automated via CI check)
• Does not contain broken links

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• You have applied a production label if this needs a manual push to Zoomin
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• You have added a new collection to Netlify CMS config (static/admin/config.js) if required (new doc sections)
• You have updated the Zoomin classification file if required (new folder of topics>

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