Improvement of text explaining Figure 16

[larsgsvensson]

In Figure 16 the server answers an unsuccessful request with 422 and includes a Link header stating which profiles it can handle for the selected resource. The text explaining the figure does not mention this link header which leaves its nature unclear.
Suggestion (to be added between "... the resource at hand." and "Such a response ...":

The server includes a Link header indicating that the resource http://example.org/bibrecord/1/DC supports the profile http://purl.org/dc/terms/ and the media type "application/xml", so that the client can re-send its request.

(If we decide to use Request Content Negotiation Style as proposed in #38, the profile would go in a Accept-Profile heading and the text be changed accordingly).

[hvdsomp]

Addressed in 64a4154