added link for equal_range.md

Author: rotarymars

reference/algorithm/equal_range.md

@@ -102,6 +102,12 @@ int main()
 }
 ```
 * equal_range[color ff0000]
+* std::vector[link /reference/vector/vector.md]
+* std::sort[link /reference/algorithm/sort.md]
+* v.begin[link /reference/vector/vector/begin.md]
+* v.end[link /reference/vector/vector/end.md]
+* std::cout[link /reference/iostream/cout.md]
+* std::endl[link /reference/ostream/endl.md]
 
 #### 出力
 ```
@@ -141,6 +147,11 @@ int main() {
 }
 ```
 * std::equal_range[color ff0000]
+* std::vector[link /reference/vector/vector.md]
+* v.begin[link /reference/vector/vector/begin.md]
+* v.end[link /reference/vector/vector/end.md]
+* std::cout[link /reference/iostream/cout.md]
+* std::endl[link /reference/ostream/endl.md]
 
 #### 出力
 ```