Fixes #11461 - Fix repetition typo on "Customizing your shell environment" page

[Bergbok]

PR Summary

Fixes a minor typo on the "Customizing your shell environment" page.

• Fixes #11461

PR Checklist

• [x] Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• [x] Summary: This PR's summary describes the scope and intent of the change.
• [x] Contributor's Guide: I have read the [contributors guide][contrib].
• [x] Style: This PR adheres to the [style guide][style].

[learn-build-service-prod[bot]]

Learn Build status updates of commit d7749c2:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/learn/shell/creating-profiles.md	:white_check_mark:Succeeded	View (>=powershell-5.1)

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