tools: fix lint issue in doctool

PR-URL: https://github.com/nodejs/node/pull/11658
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/doc/type-parser.js

@@ -89,7 +89,8 @@ module.exports = {
           typeLinks.push('<a href="' + typeUrl + '" class="type">&lt;' +
             typeTextFull + '&gt;</a>');
         } else {
-          typeLinks.push('<span class="type">&lt;' + typeTextFull + '&gt;</span>');
+          typeLinks.push('<span class="type">&lt;' + typeTextFull +
+                         '&gt;</span>');
         }
       }
     });