#14434: make tutorial link in 'help' banner version-specific
#14434: make tutorial link in 'help' banner version-specific

Without this fix, both 2.7 and 3.x would always point to the "current"
docs...which means that before this fix python 3.2 'help' pointed to the 2.7
tutorial.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator