update peermark instruction link

Author: afeld

assignments.md

@@ -85,7 +85,7 @@ Engaging with comments left in {{coding_env_name}} is more than welcome.
       1. [Upload both the `.ipynb` and `.py` files to the Assignment.](https://guides.gradescope.com/hc/en-us/articles/21865616724749-Submitting-a-Code-assignment)
    1. **If the Final Project:**
       1. Click `Final Project`. You should see the TurnItIn/PeerMark dashboard.
-      1. Follow [these instructions](https://help.turnitin.com/feedback-studio/d2l/LTI13/student/submitting-a-paper/submitting-a-paper.htm) to upload the files.
+      1. Follow [these instructions](https://guides.turnitin.com/hc/en-us/articles/21851026380813-Submitting-to-a-Feedback-Studio-assignment-using-D2L-LTI-1-3) to upload the files.
 {%- endif %}
 
 ### Notes