Update shared-channels.md

[yuokochi]

There are inconsistencies within the same document. Shared channels cannot be created by team members, but the table as being able to be created.

https://learn.microsoft.com/en-us/microsoftteams/shared-channels#shared-channel-creation

Shared channel creation Only team owners can create a shared channel. Team members can't create them.

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[MikePlumleyMSFT]

@JasonLewisMSFT can you review?

[JasonLewisMSFT]

The comment is correct, the table should be "No" for team member to create shared channels.