Fixed links.

docs/topics/infrastructure.rst

@@ -254,7 +254,7 @@ Since by now only one item was stored, so there is only one item in the results.
 SQLAlchemy Dialects
 ~~~~~~~~~~~~~~~~~~~
 
-The databases supported by core `SQLAlchemy dialects <http://docs.sqlalchemy.org/en/latest/dialects/>`
+The databases supported by core `SQLAlchemy dialects <http://docs.sqlalchemy.org/en/latest/dialects/>`__
 are Firebird, Microsoft SQL Server, MySQL, Oracle, PostgreSQL, SQLite, and Sybase. This library's
 infrastructure classes for SQLAlchemy have been tested with MySQL, PostgreSQL, and SQLite.
 
@@ -446,7 +446,7 @@ if the application has not been constructed. See the
 Django Backends
 ~~~~~~~~~~~~~~~
 
-The supported `Django backends <https://docs.djangoproject.com/en/2.0/ref/databases/>`
+The supported `Django backends <https://docs.djangoproject.com/en/2.0/ref/databases/>`__
 are PostgreSQL, MySQL, SQLite, and Oracle. This library's Django infrastructure classes
 have been tested with PostgreSQL, MySQL, SQLite.
 
@@ -538,7 +538,6 @@ that is out of the scope of this package — if you wish to do that, perhaps som
 `Zookeeper <https://zookeeper.apache.org/>`__ might help.
 
 
-
 Sequenced item mapper
 =====================