[1.5.X] Fixed #19461 - Linked to psycopg in topics/install.txt

Thanks Chris Jerdonek for the suggestion.

Backport of 6cad5f2 from master

docs/topics/install.txt

@@ -106,15 +106,15 @@ support channels provided by each 3rd party project.
 In addition to a database backend, you'll need to make sure your Python
 database bindings are installed.
 
-* If you're using PostgreSQL, you'll need the ``postgresql_psycopg2`` package.
+* If you're using PostgreSQL, you'll need the `postgresql_psycopg2`_ package.
   You might want to refer to our :ref:`PostgreSQL notes <postgresql-notes>` for
   further technical details specific to this database.
 
   If you're on Windows, check out the unofficial `compiled Windows version`_.
 
-* If you're using MySQL, you'll need the ``MySQL-python`` package, version 1.2.1p2 or higher. You
-  will also want to read the database-specific :ref:`notes for the MySQL
-  backend <mysql-notes>`.
+* If you're using MySQL, you'll need the ``MySQL-python`` package, version
+  1.2.1p2 or higher. You will also want to read the database-specific
+  :ref:`notes for the MySQL backend <mysql-notes>`.
 
 * If you're using Oracle, you'll need a copy of cx_Oracle_, but please
   read the database-specific :ref:`notes for the Oracle backend <oracle-notes>`
@@ -133,12 +133,12 @@ can simply grant Django ``SELECT``, ``INSERT``, ``UPDATE`` and
 ``ALTER TABLE`` privileges during ``syncdb`` but won't issue
 ``ALTER TABLE`` statements on a table once ``syncdb`` has created it.
 
-If you're using Django's :doc:`testing framework</topics/testing>` to test database queries,
-Django will need permission to create a test database.
+If you're using Django's :doc:`testing framework</topics/testing>` to test
+database queries, Django will need permission to create a test database.
 
 .. _PostgreSQL: http://www.postgresql.org/
 .. _MySQL: http://www.mysql.com/
-.. _psycopg: http://initd.org/pub/software/psycopg/
+.. _postgresql_psycopg2: http://initd.org/psycopg/
 .. _compiled Windows version: http://stickpeople.com/projects/python/win-psycopg/
 .. _SQLite: http://www.sqlite.org/
 .. _pysqlite: http://trac.edgewall.org/wiki/PySqlite