Update usage.md: formatting of check your config

docs/usage.md

@@ -337,9 +337,8 @@ For example check the version of software in the yaml file and the singularity r
 #### Check your configuration and parameters
 Because it has many levels of configuration we advise you to check your configuration using the following command: 
 For example:
-`module load bioinfo/nfcore-Nextflow-v21.10.6
-module load system/singularity-3.7.3
-nextflow config -profile genotoul ~/work/metagWGSNewVersion/metagwgs/main.nf` will output all the configuration that will be used by the workflow
+```module load bioinfo/nfcore-Nextflow-v21.10.6; module load system/singularity-3.7.3; nextflow config -profile genotoul ~/work/metagWGSNewVersion/metagwgs/main.nf```
+will output all the configuration that will be used by the workflow
 
 ## V. Description of output files