fix(doc): Missing dash in list

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

ADOPTERS.md

@@ -8,5 +8,5 @@
 - [IBM](https://www.ibm.com)
 - [Qovery](https://www.qovery.com/)
 - [Samsung SDS](https://www.samsungsds.com/)
-[Ville de Montreal](https://montreal.ca)
+- [Ville de Montreal](https://montreal.ca)
 _This file is part of the CNCF official documentation for projects._