Try to get the command doc comment bot working

Trying to use the `pull_request_target` triggeer instead, as that has
apparently different permissions according to:
https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#pull_request_target

Author: sholderbach

.github/workflows/command-block.yml

@@ -1,6 +1,8 @@
 name: Comment on manual command changes
 on:
-  pull_request:
+  pull_request_target:
+    types:
+      - opened
     paths:
       - 'commands/docs/**'