wireless: changed wlans_iwn0 to wlans_iwm0

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Just fixing a small typo (that I noticed after going insane).

[igalic]

iwn which is a real thing, referenced earlier, https://docs.freebsd.org/en/books/handbook/network/#config-identify-network-adapter

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Here I go not being careful enough again..
I see, thanks for the correction and I apologize for this then.

[igalic]

if iwm is the more common one, and this gets other people confused too, we could revise the page to use iwm instead, or something obviously different, like iwlwifi

[confusedjpg]

Fair enough, not sure if this one is more common as I didn't have to deal with this in the past, but I get the idea.