A number of methods in the SAML support point to Shibboleth explanations for definitions of various SAML terms. While it's quite convenient to link to a web page instead of a PDF, linking to the SAML specification is preferred since it's the source of truth.
One such example is RelyingPartyRegistration#getEntityId. Instead of linking to https://wiki.shibboleth.net/confluence/display/CONCEPT/EntityNaming it should link to https://www.oasis-open.org/committees/download.php/51890/SAML%20MD%20simplified%20overview.pdf#2.9%20EntityDescriptor