Add more detailed documentation about the different spawn methods.
Add more detailed documentation about the different spawn methods.

erikogan/passenger,kewaunited/passenger,gravitystorm/passenger,jawj/passenger,phusion/passenger,bf4/passenger,clemensg/passenger,phusion/passenger,bf4/passenger,pkmiec/passenger,cgvarela/passenger,phusion/passenger,jawj/passenger,antek-drzewiecki/passenger,kewaunited/passenger,pkmiec/passenger,phusion/passenger,clemensg/passenger,jawj/passenger,openSUSE/passenger,bf4/passenger,clemensg/passenger,fabiokung/passenger-debian,cgvarela/passenger,openSUSE/passenger,bf4/passenger,fabiokung/passenger-debian,clemensg/passenger,erikogan/passenger,bf4/passenger,fabiokung/passenger-debian,pkmiec/passenger,jawj/passenger,clemensg/passenger,fabiokung/passenger-debian,clemensg/passenger,erikogan/passenger,cgvarela/passenger,antek-drzewiecki/passenger,jawj/passenger,fabiokung/passenger-debian,bf4/passenger,erikogan/passenger,pkmiec/passenger,openSUSE/passenger,bf4/passenger,antek-drzewiecki/passenger,pkmiec/passenger,gravitystorm/passenger,kewaunited/passenger,phusion/passenger,kewaunited/passenger,phusion/passenger,pkmiec/passenger,erikogan/passenger,cgvarela/passenger,clemensg/passenger,cgvarela/passenger,phusion/passenger,gravitystorm/passenger,kewaunited/passenger,cgvarela/passenger,openSUSE/passenger,openSUSE/passenger,kewaunited/passenger,jawj/passenger,gravitystorm/passenger,jawj/passenger,kewaunited/passenger,gravitystorm/passenger,openSUSE/passenger,pkmiec/passenger,clemensg/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,erikogan/passenger,cgvarela/passenger,antek-drzewiecki/passenger,cgvarela/passenger,antek-drzewiecki/passenger,gravitystorm/passenger,antek-drzewiecki/passenger,fabiokung/passenger-debian,kewaunited/passenger,phusion/passenger