Improve Microsoft Teams setup documentation

It adds steps to set up an incoming webhook on
microsoft teams in addition to the link to the
Microsoft Teams documentation. The steps described
at the microsoft teams documentation seem to
be outdated. It was not possible add a webhook
using the "More options" button on a channel.

doc/user/project/integrations/microsoft_teams.md

@@ -9,7 +9,21 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 ## On Microsoft Teams
 
 To enable Microsoft Teams integration you must create an incoming webhook integration on Microsoft
-Teams by following the steps described in [Sending messages to Connectors and Webhooks](https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/connectors-using).
+Teams by following the steps below:
+
+1. Search for "incoming webhook" on the search bar in Microsoft Teams and select the
+   **Incoming Webhook** item.
+
+   ![Select Incoming Webhook](img/microsoft_teams_select_incoming_webhook.png)
+
+1. Click the **Add to a team** button.
+1. Select the team and channel you want to add the integration to.
+1. Add a name for the webhook. The name is displayed next to every message that
+   comes in through the webhook.
+1. Copy the webhook URL for the next steps.
+
+Learn more about
+[setting up an incoming webhook on Microsoft Teams](https://docs.microsoft.com/en-us/microsoftteams/platform/webhooks-and-connectors/how-to/connectors-using#setting-up-a-custom-incoming-webhook).
 
 ## On GitLab