Typo "Teams room system"→"Teams Rooms System"

[hyoshioka0128]

https://learn.microsoft.com/en-us/microsoftteams/network-planner https://github.com/MicrosoftDocs/OfficeDocs-SkypeForBusiness/blob/public/Teams/network-planner.md #PingMSFTDocs

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

Learn Build status updates of commit e02f7df:

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

Learn Build status updates of commit ba8aabb:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Teams/network-planner.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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[scanum]

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

[MikePlumleyMSFT]

@tonysmit can you review?

[MSTonySmith]

@scanum - I had an issue with my GH account. Please assign to MSTonySmith. Thanks!