docs: update explanation why to import iostream

vil02 · vil02 · commit d6abff8c2c7b · 2023-10-02T13:51:11.000+02:00
diff --git a/math/ncr_modulo_p.cpp b/math/ncr_modulo_p.cpp
@@ -10,7 +10,7 @@
  */
 
 #include <cassert>   /// for assert
-#include <iostream>  /// for io operations
+#include <iostream>  /// for std::cout
 #include <vector>    /// for std::vector
 
 /**
