update docs

docs/installation.md

@@ -6,12 +6,12 @@ To install manta, go to the Github [releases section](https://github.com/eth-csc
 curl --proto '=https' --tlsv1.2 -LsSf https://github.com/eth-cscs/manta/releases/download/v1.37.0/manta-installer.sh | sh
 ```
 
-If you try to run manta, you should get an error
+If you try to run manta, you should get an error because the configuration file is missing.
 
 ```bash
 $ manta --help
 Error processing config.toml file. Reason:
 configuration file "/home/msopena/.config/manta/config.toml" not found
 ```
 
-You are ready to start with the configuration
+So far so good, please proceed to the next section (Configuration) to create the manta configuration file