message: Updates 'teams channel get' documentation. Closes
diff: @@ -16,7 +16,7 @@ m365 teams channel get [options]
  `--teamName [teamName]`
  : The display name of the team to which the channel belongs to. Specify either teamId or teamName but not both
  -`-c, --channelId <channelId>`
  +`-c, --channelId [channelId]`
  : The ID of the channel for which to retrieve more information. Specify either channelId or channelName but not both
  `--channelName [channelName]`
  