Use correct default value for "Intense text formatting"

[nguyen-dows]

This PR closes #700

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

Learn Build status updates of commit 18b52f3:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
TerminalDocs/customize-settings/profile-appearance.md	:white_check_mark:Succeeded	View

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