fixed example in docs (existing example wasn't proving anything)
added docs on && short-circuiting, alongside || one
misc typos in docs
misc typos in docs
whitespace and alignment in docs
Merge remote-tracking branch 'upstream/master'
grammar and minor whitespace fixes to the program structure chapter
fixed bad spelling of "thoroughly" throughout the docs
misc fixes to traits docs
Merge branch 'master' of https://github.com/gruppo4/groovy-core into gruppo4-master

Conflicts:
	src/spec/doc/core-operators.adoc
Merge branch 'gruppo4-master'