Do you have a quick way to test whether this is a problem? I have these set in my path and environment.mine files in ~/Library/init/tcsh/ and have not had a problem reading man pages.

If you haven't noticed any problems, you probably don't need to to do anything. But if you've ever tried to get the manpage for a command that you know you have installed, and it said there was no manpage, you might want to check whether your $MANPATH variable is complete.

"manpath" will check for the $MANPATH variable, and use that if it is set. It won't try to locate any other paths, so you only have to make sure that all your man directories are in your $MANPATH variable.

running:
/usr/bin/locate '*/man'
will show you all possible man directories on your system. Compare them to the output of the manpath tool, and if there are any missing, you need to add them to your manpath variable.