Reflow some paragraphs in the contributing docs
Reflow some paragraphs in the contributing docs

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