irqbalance.1: remove misleading comment

It appears this is now the source and the original has been lost, so
don't scare people away from editing it.
irqbalance.1: update homepage
irqbalance.1: fix some typos
irqbalance.1: always capitalize CPU
irqbalance.1: always capitalize NUMA
irqbalance.1: always capitalize IRQ
irqbalance.1: line wrap description and fix grammar
irqbalance.1: use full stops when appropriate
Merge pull request #4 from toofishes/manpage

Manpage cleanups and fixes