docstring of %z to the real order displayed in the modeline.
or print Bottom or All.
%n -- print Narrow if appropriate.
%t -- visited file is text or binary (if OS supports this distinction).
- %z -- print mnemonics of buffer, terminal, and keyboard coding systems.
+ %z -- print mnemonics of keyboard, terminal, and buffer coding systems.
%Z -- like %z, but including the end-of-line format.
%e -- print error message about full memory.
%[ -- print one [ for each recursive editing level. %] similar.