Update docs/userguide/tasks.rst

Using os.getcwd() will produce unexpected results since it is based on the current working directory at the time the command is run. It looks fragile to me. The proposed approach uses the location of the setting module itself to determine the appropriate path.

docs/userguide/tasks.rst

@@ -176,7 +176,7 @@ add the project directory to the Python path::
 
     import os
     import sys
-    sys.path.append(os.getcwd())
+    sys.path.append(os.path.dirname(os.path.basename(__file__)))
 
     INSTALLED_APPS = ('myapp', )