[1.7.x] Fixed #23430 -- simplified gunicorn deployment docs.

Backport of 77b3907d6d from master

docs/howto/deployment/wsgi/gunicorn.txt

@@ -22,21 +22,15 @@ Running Django in Gunicorn as a generic WSGI application
 
 When Gunicorn is installed, a ``gunicorn`` command is available which starts
 the Gunicorn server process. At its simplest, gunicorn just needs to be called
-with the location of a WSGI application object.::
+with the location of a file containing a WSGI application object named
+`application`. So for a typical Django project, invoking gunicorn would look
+like::
 
-    gunicorn [OPTIONS] APP_MODULE
+    gunicorn myproject.wsgi
 
-Where ``APP_MODULE`` is of the pattern ``MODULE_NAME:VARIABLE_NAME``. The
-module name should be a full dotted path. The variable name refers to a WSGI
-callable that should be found in the specified module.
-
-So for a typical Django project, invoking gunicorn would look like::
-
-    gunicorn myproject.wsgi:application
-
-(This requires that your project be on the Python path; the simplest way to
-ensure that is to run this command from the same directory as your
-``manage.py`` file.)
+This will start one process running one thread listening on ``127.0.0.1:8000``.
+It requires that your project be on the Python path; the simplest way to ensure
+that is to run this command from the same directory as your ``manage.py`` file.
 
 See Gunicorn's `deployment documentation`_ for additional tips.