Use docs_sync secret name with underscore

Author: tilo-14

.github/workflows/trigger-docs-sync.yml

@@ -13,6 +13,6 @@ jobs:
         run: |
           curl -X POST \
             -H "Accept: application/vnd.github.v3+json" \
-            -H "Authorization: token ${{ secrets.docs-sync }}" \
+            -H "Authorization: token ${{ secrets.docs_sync }}" \
             https://api.github.com/repos/Lightprotocol/docs/dispatches \
             -d '{"event_type":"sync-examples"}'