Update YYYY-MM-DD-blog-title.adoc.template

Fixing typos
TOOLSDOC-550: Added howto template
Fix typo in pre-final What's New pages
Fix a few links and typos in the 4.2.0 Final release blog
JBIDE-18702 JBDS 8.0.0.CR1 and GA contain EAP 6.3.0, not EAP 6.3.0.Beta; fix label