add lmod and modify menu

docs.it4i/software/lmod.md

@@ -17,11 +17,11 @@ Introduction
 
 Below you will find more details and examples.
 
-|command|equivalent|
+|command|equivalent/explanation|
 |---|---|
 |ml|module list|
 |ml GCC/6.2.0-2.27|module load GCC/6.2.0-2.27|
-|ml -GCC| module unload GCC|
+|ml -GCC/6.2.0-2.27| module unload GCC/6.2.0-2.27|
 |ml av|module avail|
 |ml show GCC/6.2.0-2.27|module show GCC|
 |ml spider|gcc searches (case-insensitive) for gcc in all available modules|