Update AccessControl.md

Author: bh3236

swift-6-beta.docc/LanguageGuide/AccessControl.md

@@ -688,7 +688,7 @@ stringToEdit.value = "This string will be tracked."
 stringToEdit.value += " This edit will increment numberOfEdits."
 stringToEdit.value += " So will this one."
 print("The number of edits is \(stringToEdit.numberOfEdits)")
-// 打印"The number of edits is 3"
+// 打印“The number of edits is 3”
 ```
 
 <!--