Merge pull request #4238 from Blacknife/fix-conditional-formatting-a-cell-documentation

fix `Conditional formatting a cell` documentation

Author: oleibman

docs/topics/recipes.md

@@ -1293,8 +1293,8 @@ style object:
 
 ```php
 $spreadsheet->getActiveSheet()
-    ->duplicateStyle(
-        $spreadsheet->getActiveSheet()->getStyle('B2'),
+    ->duplicateConditionalStyle(
+        $spreadsheet->getActiveSheet()->getConditionalStyles('B2'),
         'B3:B7'
     );
 ```