Add digenic inheritance/disease, synonyms and fix typos

New digenic terms:
craniosynostosis 7
proteasome-associated autoinflammatory syndrome
proteasome-associated autoinflammatory syndrome 3
facioscapulohumeral muscular dystrophy 3
facioscapulohumeral muscular dystrophy 4

Added digenic inheritance:
usher syndrome type 2C
proteasome-associated autoinflammatory syndrome 1
methylmalonic aciduria and homocystinuria type cblC

squash commit of PR #1232