I’m informed that sometime today Microsoft will be posting fixed core cmdlet help files for your downloading pleasure – so it’s safe to run Update-Help again, and you should definitely do so. There are likely a lot of fixes and improvements to the help text, and you won’t be “losing” the parameter value type information from the SYNTAX section.
Maybe schedule an Update-Help for tomorrow morning?
BTW – kudos to the team at Microsoft for getting this issue fixed so quickly. It’s a shame this one snuck past them, but once notified of the problem they really did jump on it. The fact that the problem was (from the public perspective) just with the downloadable help files means it’s an easy fix that doesn’t involve pushing code out through Windows Update (thank goodness).