Update Rails 3.2.x guide link [ci skip]
Merge pull request #11620 from spajus/update_docs

Update Rails 3.2.x guide link [ci skip]
Minor refactor - Uses Enumerable#to_a instead of iterate and add to an
array
Merge pull request #11625 from phstc/minor-refactor-code-gardener-grouping

Minor refactor - Uses Enumerable#to_a instead of iterate and add to an array
Add notes about database connection pool [ci skip]