コード例の include の不足を修正

Author: Raclamusi

reference/algorithm/ranges_copy_backward.md

@@ -63,6 +63,7 @@ copy_backward_result {
 #include <algorithm>
 #include <iostream>
 #include <list>
+#include <iterator>
 
 int main() {
   std::list<int> ls = { 1,2,3,4,5 };

reference/chrono/parse.md

@@ -111,6 +111,7 @@ namespace std::chrono {
 
 ## 例
 ```cpp example
+#include <iostream>
 #include <sstream>
 #include <chrono>
 

reference/chrono/year_month_day/op_constructor.md

@@ -62,6 +62,7 @@ year_month_day(year_month_day&&) = default;                         // (7) C++20
 ### 例
 ```cpp example
 #include <cassert>
+#include <iostream>
 #include <chrono>
 
 namespace chrono = std::chrono;

reference/chrono/zoned_time/get_info.md

@@ -26,6 +26,7 @@ return zone->get_info(tp);
 ## 例
 ```cpp example
 #include <cassert>
+#include <iostream>
 #include <chrono>
 
 namespace chrono = std::chrono;

reference/chrono/zoned_time/get_local_time.md

@@ -28,6 +28,7 @@ return zone->to_local(tp);
 ## 例
 ```cpp example
 #include <cassert>
+#include <iostream>
 #include <chrono>
 
 namespace chrono = std::chrono;

reference/chrono/zoned_time/op_constructor.md

@@ -116,6 +116,7 @@ zoned_time(string_view name,
 
 ### 例
 ```cpp example
+#include <cassert>
 #include <iostream>
 #include <chrono>
 

reference/chrono/zoned_time/op_local_time.md

@@ -26,6 +26,7 @@ return get_local_time();
 ## 例
 ```cpp example
 #include <cassert>
+#include <iostream>
 #include <chrono>
 
 namespace chrono = std::chrono;

reference/iterator/const_iterator.md

@@ -23,6 +23,7 @@ namespace std {
 ## 例
 ```cpp example
 #include <iterator>
+#include <vector>
 
 int main() {
   static_assert(std::same_as<std::const_iterator<int*>, std::basic_const_iterator<int*>>);

reference/iterator/const_sentinel.md

@@ -24,6 +24,7 @@ namespace std {
 ## 例
 ```cpp example
 #include <iterator>
+#include <vector>
 
 int main() {
   static_assert(std::same_as<std::const_sentinel<int*>, std::basic_const_iterator<int*>>);

reference/iterator/indirectly_readable.md

@@ -57,6 +57,7 @@ concept indirectly_readable =
 #include <memory>
 #include <vector>
 #include <optional>
+#include <iterator>
 
 template<typename T>
 requires std::indirectly_readable<T>