Accept pipeline input?

Charlie34000​. Thank you for your comments. I ran (in admin mode) Update-Help -Force. This did not make any difference (I had run  the command without -Force earlier).

I have written notes about PowerShell meant for colleagues and students.   In the notes I explain the different parameter sets with the six sets of Get-Help as an example. At the time of writing, the off-line help files were correct. What am I supposed to do? Rewrite the notes and refer to Get-Command -Syntax or to the online help with the chance that after the next Windows update the help files (and my notes) are correct again? 

In the notes I also explain the possibility of  input through the pipeline vs.  -InputObject (or a similar parameter).  I explain in some detail how to arrive at the one-liner:

Get-Help Get-C* | 
% {Write-Host `n $_.name; 
   Get-Help $_.name -Parameter * -ea 0 | 
    % {Write-Host ("   Pos: {0,6:s}   Pipe_inp: {1,6:s} " -f   $_.position, $_.pipeLineInput), 
                  (" Parameter name: {0,1:s}" -f $_.name) 
      }
  }    

At the time I wrote this, it gave a correct table. Do I now discard this one-liner and the discussion leading to it? Again, with  the chance that it will be correct again in the near future?

All-in-all,  this business of help files comes across as amateurish. I find it rather unexpected, since PowerShell is after all an important software package  promoted (and supported?)  by one the most valuable companies in the world.