Instructions for using respec (and general Spec Writer help)

I have updated the section at: https://wiki.oasis-open.org/oslc-core/SpecWriterHandbook#SpecificationAuthoring.28respec.29

There is some guidance for using respec,
fairly incomplete for OASIS usage but should be able to get by.  See
Core WG documents for examples.

Thanks,

Steve Speicher

IBM Rational Software

OSLC - Lifecycle integration inspired by the web -> http://open-services.net