Fix typo in link at nativeMessaging docs

R=rockot@chromium.org

Review URL: https://codereview.chromium.org/1033003003

Cr-Commit-Position: refs/heads/master@{#322436}

chrome/common/extensions/docs/templates/articles/nativeMessaging.html

@@ -210,7 +210,7 @@ Here are some errors and tips for solving the issues:
     <li>
       Is the manifest file in the correct format? In particular, is the JSON
       syntax correct and do the values match the definition of a
-      <a href="native-messaging-host-manifest">native messaging host manifest</a>?
+      <a href="#native-messaging-host-manifest">native messaging host manifest</a>?
     <li>
       Does the file specified in <code>path</code> exist? On Windows, paths
       may be relative, but on OS X and Linux, the paths must be absolute.