Minor edits to text.
LRDOCS-1393 removed obsolete last.modified property from 6.2 userguide.
LRDOCS-1393 Removed obsolete last.modified.check property from discover directory.
Merge pull request #1078 from mwilliams2014/LRDOCS-1393

LRDOCS-1393 removed obsolete last.modified property from 6.2 userguide.
Merge pull request #1087 from rbohl/lrdocs-1173-javascript-portlet-url-tutorial

Minor edits to devGuide