bug#1581: eval-last-sexp truncation: mention in docstring

[jidanni]

  C-x C-e runs the command eval-last-sexp
    which is an interactive compiled Lisp function in `lisp-mode.el'.
  It is bound to <menu-bar> <emacs-lisp> <eval-sexp>, C-x C-e.
  (eval-last-sexp EVAL-LAST-SEXP-ARG-INTERNAL)

  Evaluate sexp before point; print value in minibuffer.
  Interactively, with prefix argument, print output into current buffer.

OK, but
some-variable-whose-value-is-rather-long C-u C-x C-e
will truncate the results with "..." at the end.
Please mention in the docstring how to get the entire value.

OK, (info "(emacs)Lisp Eval") mentions `eval-expression-print-level' and
`eval-expression-print-length'. OK, perhaps mention them in
eval-last-sexp etc. docstrings.