Organize the interface docs a bit better, added subheadings
Organize the interface docs a bit better, added subheadings

kimvais/cryptography,sholsapp/cryptography,Ayrx/cryptography,skeuomorf/cryptography,bwhmather/cryptography,sholsapp/cryptography,bwhmather/cryptography,Ayrx/cryptography,Hasimir/cryptography,sholsapp/cryptography,dstufft/cryptography,bwhmather/cryptography,dstufft/cryptography,Hasimir/cryptography,Hasimir/cryptography,skeuomorf/cryptography,kimvais/cryptography,bwhmather/cryptography,Hasimir/cryptography,skeuomorf/cryptography,dstufft/cryptography,dstufft/cryptography,kimvais/cryptography,dstufft/cryptography,kimvais/cryptography,Ayrx/cryptography,sholsapp/cryptography,skeuomorf/cryptography,Ayrx/cryptography