Improve the Apache documentation: add upgrading instructions and improve some of the other existing instructions.
Improve the Apache documentation: add upgrading instructions and improve some of the other existing instructions.

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