so that these can be undone as a group. By default commands
@code{self-insert-command}, which produces self-inserting input
characters (@pxref{Commands for Insertion}), and @code{delete-char}
-which deletes characters (@pxref{Deleting Text}) are amalgamating.
+which deletes characters (@pxref{Deletion}) are amalgamating.
Where a command affects the contents of several buffers as may happen,
for example, if a function on the @code{post-command-hook} affects a
buffer other than the @code{current-buffer}, then @code{undo-boundary}