Update documentation to reflect default paper size
Update documentation to reflect default paper size

Since the paper size declaration is now optional it is not so important
to include in every example. How to specific something other than the
class defaults is now explained separately from the base "Hello world!"
example and all examples than don't require special consideration have
been simplified.

Additionally I noted the other paper sizes names currently supported out of
the box so people don't have to read the source code to discover what
names are available.

alerque/sile,alerque/sile,neofob/sile,simoncozens/sile,simoncozens/sile,neofob/sile,alerque/sile,simoncozens/sile,simoncozens/sile,alerque/sile,neofob/sile,neofob/sile