Add DraftMode parameter for setting Connections default experience

[corriespondent]

When running the Viva Connections default experience SPO Management Shell command as documented, the experience is in draft mode by default, thus removing the existing home site and global nav for users. I've added the DraftMode parameter and an explanation to clarify.

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

Learn Build status updates of commit 31b7ae9:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Viva/connections/edit-viva-home.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
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[learn-build-service-prod[bot]]

Learn Build status updates of commit c1b3c35:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Viva/connections/edit-viva-home.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[scanum]

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