Phil Sainty wrote:
> I had grepped for "english" and then for "american" and "US" within
> those results, and didn't turn up any instructions to this end.

$ grep -ri 'american spell' $(git ls-files)
ChangeLog.2:	Rename using American spelling.  Update all uses.
doc/lispref/ChangeLog.1:	Prefer typical American spelling for "acknowledgment".
doc/misc/ChangeLog.1:	Prefer typical American spelling for "acknowledgment".
lisp/ChangeLog.16:	Prefer typical American spelling for "acknowledgment".
lisp/ChangeLog.16:	Emacs uses American spelling.
lisp/gnus/ChangeLog.3:	Use American spelling for 'normalize'

> Is there such a recommendation in the documentation that I missed,
> though?  If not, it sounds like it would be a good thing to add
> somewhere.

Sure, why not? I installed the attached.