Remove (no_keep_locs) doc (#3587)
Remove (no_keep_locs) doc (#3587)

In `(lang dune 2.0)` it already provides a useful error message, so the
documentation is not that useful.

Signed-off-by: Etienne Millon <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@emillon.org>
janestreet/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,janestreet/jbuilder,dra27/jbuilder,dra27/jbuilder