mis-tweaked #400

[TallTed]

vc-api/exchanges.yml

Lines 134 to 136 in 5d12fbe

	summary: Participate in an exchange. Posting an empty body will start the exchange or return
	to start the exchange will result in either a Verifiable Presentation, a Verifiable
	Presentation Request that conforms to the client's request, or a 4xx error.

Rereading the discussion, I think I mis-tweaked the language (and missed that the first line in the paragraph also needs tweaking) in #400.

Note that by posting an empty body, the client is not making any conformable request.

I think this would be a better conclusion, fixing the whole paragraph.

      summary: Participate in an exchange. Posting an empty body to start
        the exchange will result in a Verifiable Presentation, a Verifiable 
        Presentation Request, or a 4xx error.

Tagging @wes-smith @msporny @dlongley

[wes-smith]

Fixing in my changes.