doc: fix ambasador markdown list

PR-URL: #55361
Reviewed-By: Marco Ippolito <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Gireesh Punathil <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>

Author: RafaelGSS

doc/contributing/advocacy-ambasador-program.md

@@ -45,9 +45,9 @@ If there is no objection within 14 days, the nomination is approved.
 
 To onboard an ambassador, a member of the TSC will:
 
-* \[] Add the ambassador to the nodejs/ambassadors team.
-* \[] Add the ambassador to the nodejs/ambassadors `README.md`.
-* \[] Add the ambassador to the OpenJS Slack channel.
+* \[ ] Add the ambassador to the nodejs/ambassadors team.
+* \[ ] Add the ambassador to the nodejs/ambassadors `README.md`.
+* \[ ] Add the ambassador to the OpenJS Slack channel.
 
 ## Reviewing content