Fix typo that impeded correct rendering of subsequent sourcecode block (#13450)

diff --git a/doc/build/changelog/migration_21.rst b/doc/build/changelog/migration_21.rst
index 7b37de2916033c9a41702ae36445a8506b417154..e3357b595ca60a8458d8d45af5e4710857e58817 100644 (file)
--- a/doc/build/changelog/migration_21.rst
+++ b/doc/build/changelog/migration_21.rst
@@ -1612,7 +1612,7 @@ Examples to summarize the change are as follows::
     engine = create_engine("postgresql+psycopg2://user:pass@host/dbname")
 
 The ``psycopg`` DBAPI driver itself can be installed either directly
-or via the ``sqlalchemy[postgresql]`` extra::
+or via the ``sqlalchemy[postgresql]`` extra:
 
 .. sourcecode:: txt