Changed 'so' to 'see'
Allow postgresql enum_test to be run in random order.

Creating and dropping similar tables within the same connection causes postgresql to look up old values in the cache of tables which have already been dropped.
Merge pull request #14560 from abwinkler999/typo-in-RELEASING_RAILS

Changed 'so' to 'see'
Merge pull request #14550 from tgxworld/fix_failing_enum_test_random_order

Allow postgresql enum_test to be run in random order.
Refactor run_without_connection into DdlHelper.