syntax correction of installation.rst file.

doc/installation.rst

@@ -51,18 +51,21 @@ The python package requirements are curated in the `pypsa-earth/envs/environment
 The environment can be installed using:
 
 .. code:: bash
+
     /pypsa-distribution % conda env create -f pypsa-earth/envs/environment.yaml
 
 If the above takes longer than 30min, you might want to try mamba for faster installation:
 
 .. code:: bash
+
     (base) conda install -c conda-forge mamba
 
     /pypsa-distribution % mamba env create -f pypsa-earth/envs/environment.yaml
 
 Extra python package requirements are satisfied by manually installing them. Currently the ramp package is added to existing pypsa-earth environment by using:
 
 .. code:: bash
+
     /some/other/path/pypsa-distribution % conda activate pypsa-earth
 
     (pypsa-earth) pip install rampdemand
@@ -76,6 +79,7 @@ The tool provide automated ways to keep the code clean and consistent.
 To make sure to install the tool, please run:
 
 .. code:: bash
+  
     /pypsa-distribution % conda activate pypsa-earth
 
     /pypsa-distribution % pre-commit install