Merge pull request #2750 from pkoivisto/patch-1

Part 9: Fix URL to legacy material

Author: mluukkai

src/content/9/en/part9e.md

@@ -7,9 +7,9 @@ lang: en
 
 <div class="tasks">
 
-**NOTE**: this is the new section about Patientor frontend that has replaced 12th February 2023, [this chapter](/en/part9/patientor_frontend_the_old_material). In the change, the Patientor frontend structure was refactored to a simpler form that makes it much easier to focus on learning TypeScript.
+**NOTE**: this is the new section about Patientor frontend that has replaced 12th February 2023, [this chapter](/en/part9/legacy_patientor_the_old_material). In the change, the Patientor frontend structure was refactored to a simpler form that makes it much easier to focus on learning TypeScript.
 
-If you have started doing the exercises with the old Patientor, you may continue with [the old material](/en/part9/patientor_frontend_the_old_material). If not, then it is recommended to use the "new" patientor that is described in this section.
+If you have started doing the exercises with the old Patientor, you may continue with [the old material](/en/part9/legacy_patientor_the_old_material). If not, then it is recommended to use the "new" patientor that is described in this section.
 
 </div>