Revert "document argcomplete system"

This reverts commit 4a8bc29.

docs/installation.rst

@@ -21,27 +21,6 @@ Installation
 
 3. Done! Now you can :ref:`create your first test <quickstart>`
 
-Optional: CLI tab completion
-----------------------------
-
-Locust uses the argcomplete_ module to provide tab completions for the ``locust`` command line interface.
-This is entirely optional; if you don't care about tab completion, you can skip this section entirely!
-If you do want to enable tab completion, first install the ``argcomplete`` module
-into the same environment where you installed ``locust``:
-
-.. code-block:: console
-
-    $ pip3 install argcomplete
-
-Then add this line to your shell config file
-(``~/.bashrc`` if you use ``bash``, ``~/.zshrc`` if you use ``zsh``):
-
-.. code-block:: console
-
-    eval "$(register-python-argcomplete locust)"
-
-Restart your shell, and you should have working tab completion for the ``locust`` CLI!
-If this doesn't work, `check the argcomplete documentation <https://kislyuk.github.io/argcomplete/>`_.
 
 Pre-release builds
 ------------------
@@ -58,5 +37,3 @@ Install for development
 -----------------------
 
 If you want to modify Locust, or contribute to the project, see :ref:`developing-locust`.
-
-.. _argcomplete: https://github.com/kislyuk/argcomplete