Correcting type and expanding documentation for Model::invalidate().  Closes #5481
Correcting type and expanding documentation for Model::invalidate().  Closes #5481

git-svn-id: 5860920b332e8b1c20d5ac1ddb0cfb1512ef151a@7667 3807eeeb-6ff5-0310-8944-8be069107fe0

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