Apply suggestions from code review

Co-authored-by: Manuel Schlund <32543114+schlunma@users.noreply.github.com>

Author: LisaBock

_episodes/03-configuration.md

@@ -184,16 +184,22 @@ We will learn how to do this in the
 [next lesson]({{ page.root }}{% link _episodes/04-recipe.md %}).
 
 It is possible to have several configuration files with different purposes,
-for example: config-user_formalised_runs.yml, config-user_debugging.yml.
+for example: ``dask_options.yml``, ``data_sources.yml``.
 In this case, ESMValTool searches for all YAML files within each of the 
 configuration directories and merges them together. How this is done is 
 explained [here](https://docs.esmvaltool.org/projects/ESMValCore/en/
 latest/quickstart/configure.html#yaml-files).
 
+To show the final configuration that is actually used when running ESMValTool, you can use
+
+~~~bash
+esmvaltool config show
+~~~
+
 
 ## Rootpath to input data
 
-ESMValTool uses several categories (in ESMValTool, this is referred to as projects)
+ESMValTool uses several categories (in ESMValTool, these are referred to as projects)
 for input data based on their source (e.g.
 CMIP6, CMIP5, obs4mips, OBS6, OBS). For example, CMIP is used for a dataset from
 the Climate Model Intercomparison Project whereas OBS may be 
@@ -211,41 +217,40 @@ be obtained by running the command
   esmvaltool config copy data-local-esmvaltool.yml
 ~~~
 
-After the default file "data-local-esmvaltool.yml" is copied in your configuration
-folder `~/.config/esmvaltool/config-user.yml` you can update the `rootpath` and the
+After the file ``data-local-esmvaltool.yml`` has been copied to your configuration
+directory `~/.config/esmvaltool/`, you can update the `rootpath` and the
 `dirname_template` to match your file locations. The ``rootpath`` specifies the 
 directories where ESMValTool will look for input data of the specific project. The
 `dirname_template` setting describes the file structure for each project.
 
-If you are working on a HPC system there are also  several example configurations 
-for popular HPC systems, .e.g. JASMIN/DKRZ/ETH/IPSL. To list the available example 
+If you are working on a HPC system, there are also several configurations 
+for popular HPC systems, e. g. JASMIN, DKRZ, ETH, and IPSL. To list the available example 
 files, run the command:
 
 ~~~bash
   esmvaltool config list data-hpc
 ~~~
 
-To load the suitable configuration file for the HPC system at DKRZ you can type:
+To load the configuration suitable for the HPC system at DKRZ, run:
 ~~~bash
   esmvaltool config copy data-hpc-dkrz.yml
 ~~~
 
 It is also possible to ask ESMValTool to download climate model data as needed. When
-running `ESMValTool` you can automatically download the files required to run a recipe 
-from ESGF for the projects CMIP3, CMIP5, CMIP6, CORDEX, and obs4MIPs. Therefore
-we need to copy the appropriate configuration file in the default configuration folder:
+running ESMValTool you can automatically download the files required to run a recipe 
+from ESGF for the projects CMIP3, CMIP5, CMIP6, CORDEX, and obs4MIPs. For this,
+copy the appropriate configuration file by running
 
 ~~~bash
   esmvaltool config copy data-intake-esgf.yml
 ~~~
 
-Additionally we need to configure [intake-esgf]
+Additionally, it is necessary to configure [intake-esgf]
 (https://intake-esgf.readthedocs.io/en/stable/configure.html).
-This can be done by specifying a download directory in the intake-esgf configure file, 
-which is by default `~/.esgf`. Therefor copy the conf.yaml file in the 
-`~/.config/intake-esgf` folder and replace the default under `local_cache:` and add 
-this download folder also under `esg_dataroot:`. The uodated file should 
-look like this:
+This can be done by updating the `local_cache` and  `esg_dataroot`
+with your desired download directory in your
+intake-esgf configuration file located at `~/.config/intake-esgf/conf.yaml`.
+The updated file should look like this:
 > ## conf.yml
 >
 > ```yaml 
@@ -302,8 +307,8 @@ look like this:
 >> ## Solution
 >>
 >> - Are you working on your own local machine?
->>   You need to copy teh `data-local-esmvaltool.yml` into your config directory 
->>   and add the root path of the folder where the data is available (e.g., ``<your_climate_data_dir>``) as:
+>>   You need to copy `data-local-esmvaltool.yml` into your configuration directory 
+>>   and specify the root path of the folder where the data is available (e.g., ``<your_climate_data_dir>``) as:
 >>
 >>```yaml
 >>   projects:
@@ -361,7 +366,7 @@ look like this:
 >>   Site-specific path to the data for JASMIN/DKRZ/ETH/IPSL 
 >>   are already available in specific configuration files. You 
 >>   need to copy this file in your configuration directory.
->>   For example, on DKRZ:
+>>   For example, on DKRZ, run:
 >>
 >>```bash
 >>   esmvaltool config copy data-hpc-dkrz.yml