Update MR template

.gitlab/merge_request_templates/add_new_software_spotlight.md

@@ -46,6 +46,7 @@ Password: HIFISReview!
 * [ ] Centres are referenced by official names
 * [ ] License is named by SPDX identifier if possible
 * [ ] All links are pointing to the right place
+* [ ] Code blocks and headlines surrounded by newlines
 
 /cc @frust45 @konrad @jandt-desy @christian.meessen
 /assign_reviewer @marco.de.lucia