Update draw.h

Changes in comments

vpr/src/draw/draw.h

@@ -156,12 +156,12 @@ bool rgb_is_same(ezgl::color color1, ezgl::color color2);
 t_draw_layer_display get_element_visibility_and_transparency(int src_layer, int sink_layer);
 
 /**
- * @brief takes in the x and y coordinates of where the user clicked on the screen and returns the corresponding clusterBlockId that represents
- *         the clb clicked upon by the user on a currently visible FPGA layer. Search for the clb begins from the top layer to ensure to
- *         return the clusterBlockId of a clb on a higher layer during instances of overlap between clb blocks.
+ * @brief takes in the x and y world coordinates of where the user clicked on the screen and returns the corresponding clusterBlockId that represents
+ *         the clb clicked upon by the user on a currently visible FPGA layer. Search for the clb begins from the top layer to ensure it
+ *         returns the clusterBlockId of a clb on a higher layer during instances of overlap between clb blocks.
  * @param x
  * @param y
- * @return returns the ClusterBlockId of the clb at the specified (x,y) location as seen by looking downwards from the top of a 3D FPGA.
+ * @return returns the ClusterBlockId of the clb at the specified (x,y) location (in world coordinates) as seen by looking downwards from the top of a 3D FPGA.
  *         Chooses the clb on the top visible layer if there are overlapping blocks. Returns EMPTY_BLOCK_ID (-1) otherwise,if clb is not found on any visible layer.
  */
 ClusterBlockId get_cluster_block_id_from_xy_loc(double x, double y);