Improve RSABackend interface docs (fixes #1022)
Improve RSABackend interface docs (fixes #1022)

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