[docs] Installation guide lists 100mb disk space as minimal requirement for installing JBoss Fuse 6.0

https://access.redhat.com/site/documentation/en-US/JBoss_Fuse/6.0/html/Installation_Guide/files/FESBPrereqs.html lists these minimal requirements:

100MB of free disk space
2GB of RAM

100mb seem to be too low for JBoss Fuse 6.0. Perhaps the minimal installation will suffice but not the medium or full installation. We should either relate to the default installation requirements or list requirements for each distribution.