Alter abbrev definitions by editing a list of them.
Selects a buffer containing a list of abbrev definitions with
point located in the abbrev table of current buffer.
You can edit them and type C-c C-c to redefine abbrevs
according to your editing.
Buffer contains a header line for each abbrev table,
which is the abbrev table name in parentheses.
This is followed by one line per abbrev in that table:
NAME USECOUNT EXPANSION HOOK
where NAME and EXPANSION are strings with quotes,
USECOUNT is an integer, and HOOK is any valid function
or may be omitted (it is usually omitted). (fn)