Minor: change template header level

Signed-off-by: Terry Cojean <terry.cojean@kit.edu>

.gitlab/merge_request_templates/bugfix.md

@@ -13,8 +13,8 @@ _Describe important implementation details of the bugfix._
 - [ ] Bugfix is covered by additional unit tests
 - [ ] Mark the merge request as ready by removing `Draft:`
 
-# Mandatory steps before merge
+## Mandatory steps before merge
 - [ ] Reviewed by a maintainer
 - [ ] Incorporate review suggestions
 
-**You are not supposed to merge this request by yourself, the maintainers of fortan-support take care of this action!**
\ No newline at end of file
+**You are not supposed to merge this request by yourself, the maintainers of fortan-support take care of this action!**

.gitlab/merge_request_templates/feature.md

@@ -8,7 +8,7 @@ _Describe important implementation details of the feature._
 - [ ] New feature is covered by additional unit tests
 - [ ] Mark the merge request as ready by removing `Draft:`
 
-# Mandatory steps before merge
+## Mandatory steps before merge
 - [ ] Reviewed by a maintainer
 - [ ] Incorporate review suggestions