HTTP API reference: fix a typo

(cherry picked from commit 48aa250)

Author: michaelklishin

deps/rabbitmq_management/priv/www/api/index.html

@@ -1386,7 +1386,7 @@ <h2>Reference</h2>
             The list of deprecated features.
           </p>
           <p>
-            Relevant documentation guide: <a href="https://www.rabbitmq.com/docs/deprecated-features">Feature Flags</a>
+            Relevant documentation guide: <a href="https://www.rabbitmq.com/docs/deprecated-features">Deprecated Features</a>
           </p>
         </td>
       </tr>
@@ -1401,7 +1401,7 @@ <h2>Reference</h2>
             The list of deprecated features currently being used.
           </p>
           <p>
-            Relevant documentation guide: <a href="https://www.rabbitmq.com/docs/deprecated-features">Feature Flags</a>
+            Relevant documentation guide: <a href="https://www.rabbitmq.com/docs/deprecated-features">Deprecated Features</a>
           </p>
         </td>
       </tr>