Fix todo comment

Author: kgryte

lib/node_modules/@stdlib/plot/components/svg/rug/README.md

@@ -28,7 +28,7 @@ limitations under the License.
 
 <!-- <figure class="figure" align="center" label="fig:intro_plot" src="./srv/scripts/fig_intro_plot.js" alt="Scatterplot with rug plots along the axes."> -->
 
-<!-- TODO: add equation -->
+<!-- TODO: add figure -->
 
 <!-- </figure> -->