Update references.adoc

TIER · Jul 29, 2018 · 547f7b5 · 547f7b5
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 References
 ====
-.This Repository
+This Repository
+=====
 *  link:README.adoc[] 
 *  link:attributes/attributeClasses.adoc[Attribute Classes that can be used to categorize individual attributes] 
 
-.External Links
+External Links
+=====
 * https://spacetelescope.github.io/understanding-json-schema/UnderstandingJSONSchema.pdf[Understanding JSON Schema]; Good intro but somewhat dated: Refers to Draft 4, current is Draft 7
 * Phil Sturgeon’s https://philsturgeon.uk/api/2018/04/13/openapi-and-json-schema-divergence-solved/[two-part article] on 
 the convergence between http://json-schema.org/[JSON Schema] and https://www.openapis.org/[OAI 3]