Update Set-CMCollectionCloudSync.md

[rnicolson]

Adds a note about a current limitation in the cmdlet. This was confirmed by Microsoft support in a premier support case. If you would like additional details please reach out for the case number.

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**PR Title:** Fix Set-CMCollectionCloudSync

1. For Set-CMCollectionCloudSync:
   - Added note about a current limitation for the cmdlet

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