[perl #89662] PATCH to perlfunc.pod: select fix

I think it's about time--by say 20 years--that we stop passing around
filehandles as strings, especially if we don't use Symbol::qualify_to_ref()
to fix the package.  Plus it isn't strict-safe.  All fixed now.

I am somewhat concerned about the final comment regarding read
and sysread, as I don't know whether PerlIO encoding translation
issues affect this picture.

--tom