Update connect-intune-android-enterprise.md

[pianofu]

Add 'Device onboarding' as the heading that 'Enrollment' is in.

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@pianofu : Thanks for your contribution! The author(s) have been notified to review your proposed change.

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Learn Build status updates of commit 59c56d9:

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memdocs/intune/enrollment/connect-intune-android-enterprise.md	:white_check_mark:Succeeded

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[lenewsad]

#sign-off

[v-smandalika]

Hi,

This PR has been open for an extended period of time and has conflicts. If these changes are still relevant, please re-submit them to https://github.com/MicrosoftDocs/memdocs-pr.

Thanks, @v-smandalika