Typo

src/command_def.ml

@@ -123,7 +123,7 @@ let shared_params =
               implemented the best way."
 ;;
 
-(* Comman documentation for id sequences *)
+(* Common documentation for id sequences *)
 let id_parsing_doc =
   ". Id sequence means a set of ids like this: 1,4-9,17. The command is run \
    for each item of the generated list (1,4,5,6,7,8,9,17 in this case)"