Bad wording, sorry ...
I'm sure it will work fine, and it will not harm your Air.
I use several devices on the same charger.
You can also buy an adaptor magsafe 2 / magsafe for use with older devices in the MacStore.
As long as the magsafe power rating is equal to or greater than the one that came with your MBA it will work fine.
Do not use one that has a lower power rating than the one that came with your MBA.