The last 2 bytes of an Ethernet header are the "length/type field".

The last 2 bytes of an Ethernet header are the "length/type field".

Call it that, to indicate that it's not necessarily a type field.

While we're at it, get rid of references to "DEC/Intel/Xerox" and
"802.3" Ethernet headers in comments; since 802.3y, the 802.3 standard
supports both "DIX" frames, with a type field, and earlier 802.3 frames,
with a length field, so there's only one version of Ethernet, 802.3,
which supports frames with type fields and frames with length fields.