Add a line in the documentation about the role of prettier within eslint configuration

docs/source/development/es-lint.rst

@@ -12,6 +12,8 @@ This runs eslint **not** taking the baseline into account, thus showing all exis
 A script was also added to package.json allowing you to execute ``yarn run eslint``.
 This will run eslint, but **taking the baseline into account**, thus only alerting to newly created errors.
 
+The eslint command is configured to also run ``prettier`` which will simply format the code to look more uniform (takes care indentation for example).
+
 Interesting options that can be used in combination with eslint are:
 
 - ``--quiet`` to only get errors and silence the warnings