fixes td/tr typo

Author: nfiles

src/charts/line.md

@@ -229,15 +229,15 @@ You can add a [heading](../components/heading/) to your chart using the `<captio
 
 ## Multiple Datasets
 
-You can use a [single dataset](../components/data/) (one `<td>` tag in each `<td>`).
+You can use a [single dataset](../components/data/) (one `<td>` tag in each `<tr>`).
 
 ```html{2}
 <tr>
   <td> Data </td>
 </tr>
 ```
 
-Or [multiple datasets](../components/datasets/) (many `<td>` tags in `<td>`).
+Or [multiple datasets](../components/datasets/) (many `<td>` tags in `<tr>`).
 
 ```html{2-4}
 <tr>