Fix output in structural example of Composite

Author: lex111

src/RefactoringGuru/Composite/Structural/Output.txt

@@ -4,5 +4,5 @@ RESULT: Leaf
 Client: Now I get a composite tree:
 RESULT: Branch(Branch(Leaf+Leaf)+Branch(Leaf))
 
-Client: I can merge two components without checking their classes:
-RESULT: Branch(Branch(Leaf+Leaf)+Branch(Leaf)+Leaf)
+Client: I don't need to check the components classes even when managing the tree::
+RESULT: Branch(Branch(Leaf+Leaf)+Branch(Leaf)+Leaf)