* keymaps.texi (Active Keymaps): Document new POSITION argument of

* keymaps.texi (Active Keymaps): Document new POSITION argument of
`current-active-maps'.

* keymap.c (Fcurrent_active_maps): Add `position' argument.
(Fwhere_is_internal): Adjust call to `current-active-maps' to
cater for additional parameter.

* keymap.h: Adjust number of parameters to `current-active-maps'.

* doc.c (Fsubstitute_command_keys): Adjust call of
`current-active-maps'.