Update folder name

Author: nemanjarogic

src/StructuralPatterns/Composite/CompositeLibrary/FileSystemExample/FileSystemExecutor.cs

@@ -11,7 +11,7 @@ public static void Execute()
 
             var booksFolder = new Folder("Books");
             var cSharpFolder = new Folder("C#");
-            var designPatternsFolder = new Folder("project2");
+            var designPatternsFolder = new Folder("Design patterns");
 
             booksFolder.Add(cSharpFolder);
             booksFolder.Add(designPatternsFolder);