HOTFIX: HTML formatting error in upgrade docs

Introduced in PR #2824. Already fixed in the
website github.

Author: Gwen Shapira <cshapi@gmail.com>

Reviewers: Ismael Juma <ismael@juma.me.uk>

Closes #2844 from gwenshap/docs-hotfix

(cherry picked from commit 5f728532ac)
Signed-off-by: Ismael Juma <ismael@juma.me.uk>

docs/upgrade.html

@@ -115,7 +115,7 @@ Kafka cluster before upgrading your clients. Version 0.10.2 brokers support 0.8.
 
 <h5><a id="upgrade_10201_notable" href="#upgrade_10201_notable">Notable changes in 0.10.2.1</a></h5>
 <ul>
-  <li> The default values for two configurations of the StreamsConfig class were changed to improve the resiliency of Kafka Streams applications. The internal Kafka Streams producer <code>retries</code> default value was changed from 0 to 10. The internal Kafka Streams consumer <code>max.poll.interval.ms</code>  default value was changed from 300000 to <code>Integer.MAX_VALUE<code>.
+  <li> The default values for two configurations of the StreamsConfig class were changed to improve the resiliency of Kafka Streams applications. The internal Kafka Streams producer <code>retries</code> default value was changed from 0 to 10. The internal Kafka Streams consumer <code>max.poll.interval.ms</code>  default value was changed from 300000 to <code>Integer.MAX_VALUE</code>.
   </li>
 </ul>