update screenshot and split between pull request and merge

pull-request.md

@@ -6,17 +6,20 @@
 
     ![](./assets/pull-request-button.png)
 
-2. **GitHub**: **make sure the base repository is the LMU Open Science Center's original one and the head fork is yours**, both set on their main branch (these repositories should only have one branch anyway called 'main'. Branches are diverging versions of a file *within* a repository - we will not cover this concept today). Check that your requested merge does not create any conflict. If all is good, click on `Create pull request`
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+
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+2. **GitHub**: **make sure the base repository is the LMU Open Science Center's original one and the head fork is yours**, both set on their main branch (these repositories should only have one branch anyway called 'main'. Branches are diverging versions of a file *within* a repository - we will not cover this concept today). Check that your requested merge does not create any conflict. In addition, **write an informative message**, explaining your changes to your collaborator, the author of the original repository. Click on `Create pull request`
 
     ![](./assets/create-pull-request.png)
 
-3. **GitHub**: write an informative message, explaining your changes to your collaborator, the author of the original repository. Click on `Create pull request`
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-    ![](./assets/pull-request-message.png)
+3. **GitHub**: you can now see a conversation tab around your pull request in the repository of the original owner: 
 
-4. **GitHub**: check to see your collaborator's response to your request and check the original repository to see your merged changes. Most likely it will be a thumbs up! But your collaborator might also **request a correction** if they spot an error. If this session is live: go see the instructor and ask them to watch while they merge your pull request.
+    <img src="assets/created-pull-request.png" width="550">
 
-    ![](./assets/pull-request-success.png)
 
 ***