Update MR template for spotlights

.gitlab/merge_request_templates/add_new_software_spotlight.md

@@ -31,6 +31,7 @@ Password: HIFISReview!
 
 <!-- Delete this line and tell us about the spotlight -->
 
+<!-- Replace <BRANCHE_NAME> and <SLUG> with the corresponding values of the spotlight, or copy-paste the link from the review app -->
 * :point_right: **[Review link](https://hifis-review-app.hzdr.de/review-apps/hifis-overall-hifis-net/<BRANCH_NAME>/spotlights/<SLUG>)**
 
 #### Checklist for authors
@@ -39,13 +40,15 @@ Password: HIFISReview!
 
 #### Checklist for reviewers
 
+* [ ] Reference the corresponding issue in MR
 * [ ] File size of images is not too large
 * [ ] Update `date_added` attribute
 * [ ] Centres are referenced by official names
 * [ ] License is named by SPDX identifier if possible
 * [ ] All links are pointing to the right place
 
-/cc @frust45 @konrad @jandt-desy
-/assign_reviewer @christian.meessen
+/cc @frust45 @konrad @jandt-desy @christian.meessen
+/assign_reviewer @marco.de.lucia
+/milestone %Spotlights
 /label ~"Software Spotlight"
 /label ~"Progress::4_Can review"