a86: add syntax on modes and nests to ga68.vw

Signed-off-by: Jose E. Marchesi <jemarch@gnu.org>

gcc/algol68/ChangeLog

	* ga68.vw (Modes and nests): Incorporate syntax from the RR
	chapter 7.

(cherry picked from commit e123cd977b90082c71ae98cb816f607e5b9a8fd7)
1 file changed