Document trigger_item_id more explicitly

docs/Plugins.md

@@ -65,6 +65,7 @@ of the basic structure of the docker command:
 container="test"
 owner="357535074912050791323416133896"
 target_item='{"type":"Person","id":"38583224e56e6d2385d36e05af9caa5e","dateCreated":1623241923508,"dateModified":1623241923508",dateServerModified":1623241923508,"deleted":false}'
+trigger_item_id="05abe8e2ef2d0fb4992239944a71bde5"
 your_auth_json='{???}'  # depends on whether you use test auth or real system auth
 network="localhost"  # "localhost" on linux, "host.docker.internal" on Mac and Windows
 
@@ -75,7 +76,7 @@ docker run \
   --env=POD_OWNER="$owner" \
   --env=POD_AUTH_JSON="$your_auth" \
   --rm \
-  --name="test-$SRANDOM" \
+  --name="$container-$trigger_item_id" \
   -- \
   "$container"
 ```