* lisp/emacs-lisp/shortdoc.el (shortdoc-add-function): Use nconc to
actually append a new section to the list of groups while avoiding a
previous OBOE. Push a new group to the front of shortdoc--groups
without copying it, just like define-short-documentation-group does.
(buffer): Fix copypasta in unlock-buffer example.
* test/lisp/emacs-lisp/shortdoc-tests.el (shortdoc-examples): Also
check that :no-value forms demonstrate the right function.
* doc/lispref/help.texi (Documentation Groups): Clarify that @dots
in the define-short-documentation-group arglist refer to whole
key-value pairs. Fix typo in :eg-result-string description.
Make sure that each example in shortdoc actually contains the function
it illustrates, and add a test for it.
* lisp/emacs-lisp/shortdoc.el (string, list, buffer, number):
Use the right functions in examples for string-version-lessp,
lax-plist-put, point-min and ffloor.
* test/lisp/emacs-lisp/shortdoc-tests.el: New test file.
