Fix Slack link

src/_about/contributing/suggest-an-addition-or-update.html

@@ -68,7 +68,7 @@ <h3 id="present-to-design-system-council">
       You will present your work to the Design System Council at an upcoming meeting (unless you have requested an <a href="#async-review">asynchronous review</a>). The Design System Council meets every other Thursday at 11am Eastern. Experimental design requests will always be prioritized in this meeting, and teams can assume generally that they will be able to present the same week of the request.
     </p>
     <p>
-      When you are ready to present, post in the <a href="https://dsva.slack.com/archives/C01DBGX4P45">#platform-design-system</a> Slack channel and tag Carol Wong to alert the team that you have filled out an issue and would like to get on the council's agenda. During the meeting, the Design System Council will evaluate the request and make a decision.
+      When you are ready to present, post in the <a href="{{ site.slack_channel_link }}">{{ site.slack_channel_name }}</a> Slack channel and tag Carol Wong to alert the team that you have filled out an issue and would like to get on the council's agenda. During the meeting, the Design System Council will evaluate the request and make a decision.
     </p>
     <p>
       <strong>If your component or pattern request is rejected</strong>, the council will add notes as to why and what they suggest you do instead in the issue.