artifacts description should be expressive

[JohnMoehrke]

Given each artifact ends up on a flat narrative on the artifacts page; the narrative for the artifact should be expressive to explain the artifact to a minimal degree. This narrative is markdown so can include markdown friendly expressions like bullet lists. (See MHD for examples).

[oliveregger]

@JohnMoehrke is this for the following 4 artefacts or are more concerned?

PIXm Patient constraints	StructureDefinition for Patient resource constraints in the IHE PIXm Profile.
PIXm Patient Profile example for additional Manager constraints	Example StructureDefinition for additional Patient resource constraints (requiring birthDate) by the Patient Identifier Cross-reference Manager.
IHE PIXm Query Parameters In	StructureDefinition for Input Parameters for $pixm operation
IHE PIXm Query Parameters Out	StructureDefinition for Ouput Parameters for $pixm operation

[oliveregger]

add more description text to the conformance resources