Simplify the colcon-argcomplete documentation. (#4433) (#4436)

* Simplify the colcon-argcomplete documentation.

The colcon documentation already states that there may
be different locations for the argcomplete script depending
on how it was installed.  Just use that documentation as
a reference point.

Signed-off-by: Chris Lalancette <[email protected]>
(cherry picked from commit 29f4464)

Co-authored-by: Chris Lalancette <[email protected]>

Author: mergify[bot]

source/Tutorials/Beginner-Client-Libraries/Colcon-Tutorial.rst

@@ -334,28 +334,8 @@ To undo this in Linux and macOS, locate your system's shell startup script and r
 Setup ``colcon`` tab completion
 -------------------------------
 
-The command ``colcon`` `supports command completion <https://colcon.readthedocs.io/en/released/user/installation.html#enable-completion>`__ for bash and bash-like shells if the ``colcon-argcomplete`` package is installed.
-
-.. tabs::
-
-   .. group-tab:: Linux
-
-      .. code-block:: console
-
-        echo "source /usr/share/colcon_argcomplete/hook/colcon-argcomplete.bash" >> ~/.bashrc
-
-   .. group-tab:: macOS
-
-      .. code-block:: console
-
-        echo "source $HOME/.local/share/colcon_argcomplete/hook/colcon-argcomplete.bash" >> ~/.bash_profile
-
-   .. group-tab:: Windows
-
-      Not yet available
-
-Depending on the way you installed ``colcon`` and where your workspace is, the instructions above may vary, please refer to `the documentation <https://colcon.readthedocs.io/en/released/user/installation.html>`__ for more details.
-To undo this in Linux and macOS, locate your system's shell startup script and remove the appended source command.
+The ``colcon`` command supports command completion for bash and bash-like shells.
+The ``colcon-argcomplete`` package must be installed, and `some setup may be required <https://colcon.readthedocs.io/en/released/user/installation.html#enable-completion>`__ to make it work.
 
 Tips
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