[spec] Refine abstract syntax of modules to use list

Author: rossberg

specification/wasm-3.0/1.4-syntax.modules.spectec

@@ -44,7 +44,18 @@ syntax export hint(desc "export") =
   EXPORT name externidx
 
 syntax module hint(desc "module") =
-  MODULE type* import* tag* global* mem* table* func* data* elem* start? export*
+  MODULE
+    list(type)
+    list(import)
+    list(tag)
+    list(global)
+    list(mem)
+    list(table)
+    list(func)
+    list(data)
+    list(elem)
+    start?
+    list(export)
 
 
 ;; Meta variables

specification/wasm-latest/1.4-syntax.modules.spectec

@@ -44,7 +44,18 @@ syntax export hint(desc "export") =
   EXPORT name externidx
 
 syntax module hint(desc "module") =
-  MODULE type* import* tag* global* mem* table* func* data* elem* start? export*
+  MODULE
+    list(type)
+    list(import)
+    list(tag)
+    list(global)
+    list(mem)
+    list(table)
+    list(func)
+    list(data)
+    list(elem)
+    start?
+    list(export)
 
 
 ;; Meta variables