poly'd hero hiding feedback

When hiding as a monster, say so during the #monster command and
also list being hidden in the status section of enlightenment/^X.

     Also, prevent hiding on the floor or ceiling on the planes of air
and water.  (Didn't apply to monsters, who only hide on ROOM spots.)

     Half the change to dohide() is just revised indentation.

doc/fixes35.0

@@ -780,6 +780,7 @@ for poly'd hero hiding on ceiling, attack by sea monsters won't move them
 	into hero's position unless it is over water or they're already on land
 for poly'd hero hiding on ceiling, attack by long worm might fill hero's
 	destination with worm's tail, so double check and maybe choose again
+poly'd hero can't hide on floor or ceiling when on Planes of Air or Water
 when shop prices are adjusted, handle roundoff (integer truncation) better
 for hero poly'd into a monster form that lacks a weapon attack but has a claw
 	attack, use wielded weapon even when claw attack isn't the very first