Style Guide: Enshrine or discard definition list formatting

[RichardJJG]

Decide whether definition list formatting is part of Knative Style and then, if it is, document it in the style guide.

The alternative to definition list formatting is tables.

Definition list formatting

Table formatting

I've added this issue to the DUX WG agenda.

[csantanapr]

I vote for Tables !

[nainaz]

I vote for Tables !

[RichardJJG]

Tables received unanimous support in the DUX Working Group meeting.
Explicitly state in the style guide that we use tables for lists of definitions.

[abrennan89]

Related: #3837 - our table formatting needs to be cleaned up a bit

[abrennan89]

There was also this discussion #3865 about it, but I guess we're going with tables then.

[RichardJJG]

/assign