More doc updates for FLASK_APP

Author: mitsuhiko

docs/server.rst

@@ -16,7 +16,9 @@ The :command:`flask` command line script (:ref:`cli`) is strongly recommended fo
 development because it provides a superior reload experience due to how it
 loads the application.  The basic usage is like this::
 
-    $ flask -a my_application --debug run
+    $ export FLASK_APP=my_application
+    $ export FLASK_DEBUG=1
+    $ flask run
 
 This will enable the debugger, the reloader and then start the server on
 *http://localhost:5000/*.
@@ -25,7 +27,7 @@ The individual features of the server can be controlled by passing more
 arguments to the ``run`` option.  For instance the reloader can be
 disabled::
 
-    $ flask -a my_application --debug run --no-reload
+    $ flask run --no-reload
 
 In Code
 -------
@@ -40,11 +42,11 @@ Example::
         app.run()
 
 This works well for the common case but it does not work well for
-development which is why from Flask 1.0 onwards the :command:`flask` method is
-recommended.  The reason for this is that due to how the reload mechanism
-works there are some bizarre side-effects (like executing certain code
-twice, sometimes crashing without message or dying when a syntax or
-import error happens).
+development which is why from Flask 0.11 onwards the :command:`flask`
+method is recommended.  The reason for this is that due to how the reload
+mechanism works there are some bizarre side-effects (like executing
+certain code twice, sometimes crashing without message or dying when a
+syntax or import error happens).
 
 It is however still a perfectly valid method for invoking a non automatic
 reloading application.