Address issue 4015 - troubleshooting tip for Zowe cert config

[janan07]

Describe your pull request here: Address issue 4015 - troubleshooting tip for Zowe config

List the file(s) included in this PR: troubleshooting-zos-certificates.md in v2.18

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[github-actions]

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[github-actions]

📌 The subject area label is missing. Add an area: label so we know what your content is about.

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💾 The release label is missing. Add a release: label so your content is published with the correct major Zowe release.

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[github-actions]

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