Update change-your-sharepoint-domain-name.md

[RaphaelTagliani]

This page actually explains how to change the subdomain name, not the domain name. The title is a source of confusion for our customers. Thank you.

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

Learn Build status updates of commit fd06be3:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
SharePoint/SharePointOnline/change-your-sharepoint-domain-name.md	:white_check_mark:Succeeded

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[scanum]

@MikePlumleyMSFT PR has been copyedited and is ready for final review, could you please check and merge? Thanks!

[MikePlumleyMSFT]

@scanum please confirm this change with the ms.reviewer for the article. Thanks.

[scanum]

@jmcdowe PR has been copyedited and is ready for final review, could you please check and merge? Thanks!