squash - Pluggable Rule Engine: Add Metadata Guard

Author: alanking

docs/plugins/pluggable_rule_engine.md

@@ -332,7 +332,15 @@ Each option is explained below.
 ```
 Once you've decided on what your config will be, you'll need to use `imeta` to set it. For example:
 ```bash
-$ imeta set -C /tempZone irods::metadata_guard '{"prefixes": ["irods::"], "admin_only": true}'
+$ imeta set -C /tempZone irods::metadata_guard '{
+    "prefixes": ["irods::"],
+    "admin_only": false,
+    "editors": [
+        {"type": "group", "name": "rodsadmin"},
+        {"type": "user", "name": "otherrods"},
+        {"type": "user", "name": "alice" }
+    ]
+}'
 ```
 Anytime a request to modify metadata is detected by the server, the Rule Engine Plugin will read the JSON
 config and determine whether the user should be allowed to continue.