Fix typo

tasks/install-service.yml

@@ -5,7 +5,7 @@
 
 - name: Téléchargement de l'archive
   get_url:
-    url: https://github.com/hedgedoc/hedgedoc/releases/download/{{hedgedoc-version}}/hedgedoc-{{hedgedocs-version}}.tar.gz
+    url: https://github.com/hedgedoc/hedgedoc/releases/download/{{hedgedoc_version}}/hedgedoc-{{hedgedocs_version}}.tar.gz
     dest: /home/hedgedocs/hedgedoc-source.tar.gz
 
 - name: Extraction de l'archive