[libs][rr-graph] fix comment

Author: amin1377

libs/librrgraph/src/base/check_rr_graph.cpp

@@ -515,10 +515,10 @@ void check_rr_node(const RRGraphView& rr_graph,
             }
             rr_graph_sides = rr_graph.node_sides(rr_node);
             std::tie(std::ignore, std::ignore, arch_side_vec) = get_pin_coordinates(type, ptc_num, std::vector<e_side>(TOTAL_2D_SIDES.begin(), TOTAL_2D_SIDES.end()));
-            // Number of sides in arch_side_vec may be higher than rr_graph sides since there may be duplicates (a pin may have different x/y offset on the same side)
-            // Because of that, we iterate over arch_side_vec and check if the side is in rr_graph_sides     
-            for (size_t i = 0; i < arch_side_vec.size(); i++) {
-                if (std::find(rr_graph_sides.begin(), rr_graph_sides.end(), arch_side_vec[i]) == rr_graph_sides.end()) {
+            // sides in the architecture are a superset of the sides for a pin in RR Graph. We iterate over the sides stored
+            // in the RR Graph to ensure that all of them also exist in the architecture.   
+            for (size_t i = 0; i < rr_graph_sides.size(); i++) {
+                if (std::find(arch_side_vec.begin(), arch_side_vec.end(), rr_graph_sides[i]) == arch_side_vec.end()) {
                     VPR_FATAL_ERROR(VPR_ERROR_ROUTE,
                                 "in check_rr_node: inode %d (type %d) has a different side '%s' in the RR graph and the architecture.\n", 
                                 inode,