The second paragraph is outdated, it describes how the old wield command would try to stick weapons in the offhand.

Also the syntax could be updated to include the target, e.g.

wield <weapon>


'DUAL WIELD' DUAL DUAL-WIELD DUALWIELD (615)

Syntax: wield or wield mainhand
dualwield or wield offhand

Taking the time to learn how to fight with a weapon in each hand is no
easy feat. Pure magic-users are unable to dedicate themselves to this
art. The ability to dual wield is affected by several things: your
dexterity, your strength, and the weight of your weapons, etc.
Some weapons are unable to be dual-wielded because of the nature of their
use. A polearm, for example, requires the use of two hands to be used
properly. You cannot wield a secondary weapon that weighs more than 75%
of your primary weapon. In the cases of lighter weapons, this is not
true, but will depend on the weapon you wish to use as your secondary
weapon (for example, you _can_ dual wield with a whip as your primary
weapon even though whips are very light).

How it should work: If you are wearing no weapons and try to wear one, it
will stick it in your main weapon slot. If you are wearing one weapon and
try to wear another weapon, if you don't know dual wield or if the weapon
is not suitable to be dual wielded, it will try to replace your main weapon
with the new weapon...otherwise it will attempt to dual wield it. If you
are already wearing two weapons, if the weapon is suitable for dual wield,
it will try to stick it in that slot, otherwise, it will try to stick it
in your main weapon slot.

Dual wield has an affect on things like shield block, parry, dodge.

Thieves can backstab with a dagger in their dual wield slot if their
main weapon is not a dagger. You need to practice the skill before you
can try to dual wield weapons. Through experimentation, you will learn
which weapons can go with which.

Felar may only dual wield with their claws.

Thanks!
-Ish