removed deprecated increment_open_transactions
Remove deprecated `decrement_open_transactions`.
Remove deprecated `transaction_joinable=`

in favor of `begin_transaction`
with `:joinable` option.
Remove deprecated `scope` use without passing a callable object.

Removed tests from deprecated code.
Merge pull request #11277 from arunagw/deprecation-removed

Deprecation removed
Missing closing + in documentation [ci skip]
Remove deprecated String constructor from `ActiveRecord::Migrator`.
[ci skip] Separated full stop from the Optimistic_concurrency_control wiki link d4e3f8ba826cd42aa3c242149
Merge pull request #11286 from edogawaconan/fix/doc-201307041646

Missing closing + in documentation [ci skip]
Merge pull request #11285 from ankit8898/master

Fixing the broken wikipedia link for Optimistic Concurrency control [ci skip]
Remove deprecated block filter from `ActiveRecord::Migrator#migrate`.
replace artificial space with RDoc markup (follow up #11285). [ci skip]