[1.5.X] Fixed #19442 - Clarified that raw SQL must be committed.

Django requires that every transaction that is opened is closed before

the completion of a request. If you are using :func:`autocommit` (the

default commit mode) or :func:`commit_on_success`, this will be done

for you automatically. However, if you are manually managing

for you automatically (with the exception of :ref:`executing custom SQL

<executing-custom-sql>`). However, if you are manually managing

transactions (using the :func:`commit_manually` decorator), you must

ensure that the transaction is either committed or rolled back before

a request is completed.