chore: cleanup in shacl shacl declaration

Author: jeswr

shacl12-vocabularies/shacl-shacl.ttl

@@ -161,9 +161,9 @@ shsh:ShapeShape
 	] ;
 	sh:property [
 		sh:path sh:in ;
-		sh:maxCount 1 ;                 # in-maxCount
-		sh:minListLength 1 ;            # in-minListLength
-		sh:memberShape [] ;             # in-memberShape
+		sh:maxCount 1 ;                     # in-maxCount
+		sh:minListLength 1 ;                # in-minListLength
+		sh:memberShape [ a sh:NodeShape ] ; # in-memberShape
 	] ;
 	sh:property [
 		sh:path sh:languageIn ;