Emacs 28 adds the outline-cycle-buffer feature. Currently there is no keybinding
to fold the outline of a pdf. So let's replace show-all by it for >= Emacs 28,
because it is easier to remember a single keybinding for folding and unfolding
then having separate bindings for those.
- Removed the word `Manipulation` from the transient state titles:
- Buffer Manipulation Transient State and Window Manipulation TS
- Expanded the TS abbreviation to Transient State
- Documented the Buffer Transient State key binding:
`q` to quit the transient state
- Capitalized `Transient State` in the titles
- Window Transient State:
- Added a line break after the title in the folded hint.
This allows for more keys to be visible horizontally.
- Moved up the [?] help key after the title, so that
it's in the same place in both the folded and full
transient state.
