correct comment for void draw_crit_path

vpr/src/draw/draw_basic.h

@@ -113,7 +113,7 @@ void draw_crit_path(ezgl::renderer* g);
  * and indexes map. It is primarily used in server mode, where items are drawn upon request.
  *
  * @param paths The vector of TimingPath objects representing the critical paths.
- * @param indexes The map of sets containing indexes of critical path elements to draw.
+ * @param indexes The map of sets, where map keys are path indices and each set contains the indices of sub-path elements to draw.
  * @param g Pointer to the ezgl::renderer object on which the elements will be drawn.
  */
 void draw_crit_path_elements(const std::vector<tatum::TimingPath>& paths, const std::map<std::size_t, std::set<std::size_t>>& indexes, bool draw_crit_path_contour, ezgl::renderer* g);