Documentation: update installation for using python 3.11.9

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@roscar @schmidtp

docs/development/installation.md

@@ -11,20 +11,14 @@ to do this.
 
 ## Installation using python virtual environment - recommended
 
-`pycalibration` uses Python 3.11. Currently, the default
-python installation on Maxwell is still Python 3.6.8, so Python 3.8
-needs to be loaded from a different location.
-
-One option is to use the Maxwell Spack installation, running `module
-load maxwell` will activate the test Spack instance from
-DESY, then you can use `module load
-python-3.8.6-gcc-10.2.0-622qtxd` to Python 3.8. Note that
-this Spack instance is currently a trial phase and may not be stable.
-
-Another option is to use `pyenv`, we provide a pyenv
-installation at `/gpfs/exfel/sw/calsoft/.pyenv` which we use
-to manage different versions of python. This can be activated with
-`source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate`
+`pycalibration` uses the same version of Python as Karabo, which in June 2021
+updated to use Python 3.11. Currently the default python installation on Maxwell
+is still Python 3.9, so Python 3.11 needs to be loaded from a different
+location.
+
+Therefore `pyenv` is used, we provide a pyenv installation at
+`/gpfs/exfel/sw/calsoft/.pyenv` which we use to manage different versions of
+python. This can be activated with ``source /gpfs/exfel/sw/calsoft/.pyenv/bin/activate``
 
 A quick setup would be: