Update groups.yml (#23828)

Added new example query.

---------

Co-authored-by: Eric <eashaw@sailsjs.com>

schema/osquery_fleet_schema.json

@@ -11308,7 +11308,7 @@
     "evented": false,
     "cacheable": false,
     "notes": "* On Windows, `gid` and `gid_signed` are always the same",
-    "examples": "See all groups with the IsHidden OpenDirectory attribute\n\n```\nSELECT * FROM groups WHERE is_hidden='1';\n```",
+    "examples": "See all groups with the `IsHidden` OpenDirectory attribute:\n\n```\nSELECT * FROM groups WHERE is_hidden='1';\n```\n\nCollect the users that are members of the `admin` group:\n\n```\nSELECT * FROM groups JOIN user_groups USING (gid) JOIN users USING (uid) WHERE groupname='admin';\n```",
     "columns": [
       {
         "name": "gid",

schema/tables/groups.yml

@@ -1,10 +1,16 @@
 name: groups
 examples: |-
-  See all groups with the IsHidden OpenDirectory attribute
+  See all groups with the `IsHidden` OpenDirectory attribute:
   
   ```
   SELECT * FROM groups WHERE is_hidden='1';
   ```
+  
+  Collect the users that are members of the `admin` group:
+
+  ```
+  SELECT * FROM groups JOIN user_groups USING (gid) JOIN users USING (uid) WHERE groupname='admin';
+  ```
 columns:
   - name: group_sid
     platforms: