(fix) added spaces to clarify

0001-ast-script-lock.md

@@ -437,15 +437,17 @@ Unlock :
         
     4                                (our script have 4 asts)
       SIG 0 <PKHash0> INPUT 0          (sig 0)
+
       AST_HASH <Hash>                  (we provide only the hash of the unused AST)
+
       SIG 0 <PKHash2> INPUT 2          (sig 2)
+
       GREAT_EQUAL
         SUM 3
           INCLUDE 0             (include above script 0)
           INCLUDE 1             (include above script 1 / could be replaced with an AST_HASH too)
           INCLUDE 2             (include above script 2)
         2
-
 ```
 
 Unlock in hex :