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MINOR: Add missing upgrade doc for 2.8 (#11343) 

Reviewers: Manikumar Reddy <manikumar.reddy@gmail.com>
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</li>
</ul>
<h4><a id="upgrade_2_8_1" href="#upgrade_2_8_1">Upgrading to 2.8.1 from any version 0.8.x through 2.7.x</a></h4>
<p><b>If you are upgrading from a version prior to 2.1.x, please see the note below about the change to the schema used to store consumer offsets.
Once you have changed the inter.broker.protocol.version to the latest version, it will not be possible to downgrade to a version prior to 2.1.</b></p>
<p><b>For a rolling upgrade:</b></p>
<ol>
<li> Update server.properties on all brokers and add the following properties. CURRENT_KAFKA_VERSION refers to the version you
are upgrading from. CURRENT_MESSAGE_FORMAT_VERSION refers to the message format version currently in use. If you have previously
overridden the message format version, you should keep its current value. Alternatively, if you are upgrading from a version prior
to 0.11.0.x, then CURRENT_MESSAGE_FORMAT_VERSION should be set to match CURRENT_KAFKA_VERSION.
<ul>
<li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g., <code>2.7</code>, <code>2.6</code>, etc.)</li>
<li>log.message.format.version=CURRENT_MESSAGE_FORMAT_VERSION (See <a href="#upgrade_10_performance_impact">potential performance impact
following the upgrade</a> for the details on what this configuration does.)</li>
</ul>
If you are upgrading from version 0.11.0.x or above, and you have not overridden the message format, then you only need to override
the inter-broker protocol version.
<ul>
<li>inter.broker.protocol.version=CURRENT_KAFKA_VERSION (e.g., <code>2.7</code>, <code>2.6</code>, etc.)</li>
</ul>
</li>
<li> Upgrade the brokers one at a time: shut down the broker, update the code, and restart it. Once you have done so, the
brokers will be running the latest version and you can verify that the cluster's behavior and performance meets expectations.
It is still possible to downgrade at this point if there are any problems.
</li>
<li> Once the cluster's behavior and performance has been verified, bump the protocol version by editing
<code>inter.broker.protocol.version</code> and setting it to <code>2.8</code>.
</li>
<li> Restart the brokers one by one for the new protocol version to take effect. Once the brokers begin using the latest
protocol version, it will no longer be possible to downgrade the cluster to an older version.
</li>
<li> If you have overridden the message format version as instructed above, then you need to do one more rolling restart to
upgrade it to its latest version. Once all (or most) consumers have been upgraded to 0.11.0 or later,
change log.message.format.version to 2.8 on each broker and restart them one by one. Note that the older Scala clients,
which are no longer maintained, do not support the message format introduced in 0.11, so to avoid conversion costs
(or to take advantage of <a href="#upgrade_11_exactly_once_semantics">exactly once semantics</a>),
the newer Java clients must be used.
</li>
</ol>
<h5><a id="upgrade_280_notable" href="#upgrade_280_notable">Notable changes in 2.8.0</a></h5>
<ul>
<li>