bug#19338: [PATCHv2 2/2] eldoc: convert `eldoc-documentation-function' into a defcustom

[Michal Nazarewicz]

On Thu, Dec 11 2014, Michal Nazarewicz <mpn@google.com> wrote:
> * lisp/emacs-lisp/eldoc.el (eldoc-documentation-function): Change from
> defvar to defcustom with `describe-char-eldoc' function as one of the
> suggested values.  Describe how major modes should use `add-function' to
> alter value of the defcustom.

FYI, v3 1/2 and this patch pushed to master except without changing the
variable to defcustom.

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