Clarify that bundle extras should not be used for PyPi installs (#23697)

The bundle extras we have are only used for development and they
should not be used to install airflow from PyPI. This update
to documentation clarifies it.

Closes: #23692
(cherry picked from commit 310002e)

docs/apache-airflow/extra-packages-ref.rst

@@ -294,7 +294,12 @@ Those are extras that provide support for integration with external systems via
 Bundle extras
 -------------
 
-Those are extras that install one ore more extras as a bundle.
+Those are extras that install one ore more extras as a bundle. Note that those extras should only be used for "development" version
+of Airflow - i.e. when Airflow is installed from sources. Because of the way how bundle extras are constructed they might not
+work when airflow is installed from 'PyPI`.
+
+If you want to install Airflow from PyPI with "all" extras (which should basically be never needed - you almost never need all extras from Airflow),
+you need to list explicitly all the non-bundle extras that you want to install.
 
 +---------------------+-----------------------------------------------------+------------------------------------------------------------------------+
 | extra               | install command                                     | enables                                                                |