doc: fix bad html tags in editors.html

Change-Id: Ib8ef626ae6bc66571ecf4569e37feb75b4b90d10
Reviewed-on: https://go-review.googlesource.com/82555Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

doc/editors.html

@@ -178,9 +178,9 @@ The following feature matrix lists and compares the most significant features.
   </tr>
   <tr class="download">
     <td></td>
-    <td><a href="https://github.com/fatih/vim-go">Install<a/></td>
-    <td><a href="https://marketplace.visualstudio.com/items?itemName=lukehoban.Go">Install<a/></td>
-    <td><a href="https://www.jetbrains.com/go">Install<a/></td>
+    <td><a href="https://github.com/fatih/vim-go">Install</a></td>
+    <td><a href="https://marketplace.visualstudio.com/items?itemName=lukehoban.Go">Install</a></td>
+    <td><a href="https://www.jetbrains.com/go">Install</a></td>
     <td><a href="https://atom.io/packages/go-plus">Install</a></td>
   </tr>
 </table>