Re: doc elisp intro cross reference fixes

[Richard Stallman]

    It used to be true back when doc-strings were dumped into the
    executable and memory was scarce.  

Exactly.  We wrote comments instead of doc strings for internal
functions and variables.

    But I believe doc-strings for internal variables and functions are
    considered acceptable these days.

That's correct.  Nowadays, we may as well make these comments into doc
strings.  They are easier to find that way, and it does no harm.