basic_ios::operator void*() に cpp11removed を追加

Author: Raclamusi

reference/ios/basic_ios/op_voidptr.md

@@ -3,6 +3,7 @@
 * std[meta namespace]
 * basic_ios[meta class]
 * function[meta id-type]
+* cpp11removed[meta cpp]
 
 ```cpp
 operator void*() const;