scratch/undo-apply updated (a34caecb046 -> ae89b15a0ad)

ellerh pushed a change to branch scratch/undo-apply.

      from  a34caecb046 Improve undo-in-region support for combine-change-calls
       new  d86df4449b9 Less generic error message
       new  ae89b15a0ad Document the new undo-list entry kind


Summary of changes:
 doc/lispref/text.texi | 7 +++++++
 lisp/subr.el          | 4 ++--
 src/buffer.c          | 6 ++++++
 3 files changed, 15 insertions(+), 2 deletions(-)