Fix typo

[kirkster96]

Describe your pull request here: update doc to fix typo

List the file(s) included in this PR:
docs/user-guide/install-zos.md

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[github-actions]

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[github-actions]

📁 The PR description is missing the file name(s) for the updated content. List all the files included in this PR so this information displays in our Zowe Docs GitHub Slack channel.

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[zowe-robot]

/labels doc doc V2

The following labels are invalid: doc, doc, V2

[janan07]

Addressed in #3565