added link for is_sorted.md

Author: rotarymars

reference/algorithm/is_sorted.md

@@ -64,6 +64,13 @@ int main()
 }
 ```
 * std::is_sorted[color ff0000]
+* std::vector[link /reference/vector/vector.md]
+* std::cout[link /reference/iostream/cout.md]
+* std::boolalpha[link /reference/ios/boolalpha.md]
+* std::endl[link /reference/ostream/endl.md]
+* v.begin[link /reference/vector/vector/begin.md]
+* v.end[link /reference/vector/vector/end.md]
+* std::sort[link sort.md]
 
 ### 出力
 ```