Fix incorrect mathjax rendering in spec section 2
Fix incorrect mathjax rendering in spec section 2

Fixes scala/bug#10364

scala/scala,martijnhoekstra/scala,scala/scala,lrytz/scala,martijnhoekstra/scala,martijnhoekstra/scala,lrytz/scala,martijnhoekstra/scala,scala/scala,scala/scala,scala/scala,martijnhoekstra/scala,martijnhoekstra/scala,lrytz/scala,lrytz/scala,lrytz/scala,lrytz/scala,scala/scala