fix(_comp_split): update error message for the correct options

Author: akinomyoga

bash_completion

@@ -372,7 +372,7 @@ _comp_split()
     shift "$((OPTIND - 1))"
     if (($# != 2)); then
         printf '%s\n' "bash_completion: $FUNCNAME: unexpected number of arguments" >&2
-        printf '%s\n' "usage: $FUNCNAME [-a] [-F SEP] ARRAY_NAME TEXT" >&2
+        printf '%s\n' "usage: $FUNCNAME [-al] [-F SEP] ARRAY_NAME TEXT" >&2
         return 2
     elif [[ $1 == @(*[^_a-zA-Z0-9]*|[0-9]*|''|_*|IFS|OPTIND|OPTARG|OPTERR) ]]; then
         printf '%s\n' "bash_completion: $FUNCNAME: invalid array name '$1'" >&2