typo: index.html

Author: andre-nguyen

index.html

@@ -50,7 +50,7 @@ <h3 class="text-center">Get Involved</h3>
                 <a href="https://github.com/micro-ROS/">https://github.com/micro-ROS/</a> and
                 we answer both tickets and pull requests as usual.
                 If you have questions on concepts and development, you're very welcome
-                to post to <a href="https://discourse.ros.org/c/embedded">the embedded catgory on ROS Discourse</a>.
+                to post to <a href="https://discourse.ros.org/c/embedded">the embedded category on ROS Discourse</a>.
                 For usage questions, head over to <a href="http://answers.ros.org/">ROS Answers</a>
                 and please tag your question with <a href="https://answers.ros.org/questions/scope:all/sort:activity-desc/tags:embedded/">embedded</a>.
             </p>