If dotspacemacs-auto-generate-layout-names is non-nil, and the user
tries to open a layout in a position that doesn't yet have a layout,
then create a new layout with an automatically generated name.
- add `l` to workspace transient state to go back to layout transient
state
- remove erroneous `l` and `h` keys on layouts transient state
- unique documentation toggle for layouts and workspaces
- reformat and sort transient states documentation
