Update process/templates/WG_NAME_sandbox_stage.md

Co-authored-by: Zach Steindler <steiza@github.com>
Signed-off-by: Sarah Evans <140007827+sevansdell@users.noreply.github.com>

process/templates/WG_NAME_sandbox_stage.md

@@ -18,13 +18,10 @@ TAC sponsor agrees to attend WG meetings regularly, although they are not requir
 
 ### Working Group References
 The WG should provide a list of existing resources with links to the repository, and if available, website and any other material to showcase the existing breadth, maturity, and direction of the WG.
+
 | Reference           | URL |
 |---------------------|-----|
 | Repo                |     |
-| Meeting Agenda      |     |
-| OSSF Calendar Entry |     |
 | Website             |     |
-| Contributing guide  |     |
-| Security.md         |     |
-| Roadmap             |     |
+| Security.md    |     |
 | Other               |     |