healthcare API: add comment on update/patch FHIR resource (#4114)
healthcare API: add comment on update/patch FHIR resource (#4114)

* Add comment on update/patch FHIR resource that the supplied example is meant to work only with Patient

* Expand on comment
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples