Indicate in documentation that newer version of AR support eager loading in polymorphic associations. Closes #10861 [fxn]
Indicate in documentation that newer version of AR support eager loading in polymorphic associations. Closes #10861 [fxn]

git-svn-id: afc9fed30c1a09d8801d1e4fbe6e01c29c67d11f@8707 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

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