docs: comments and phrasing

docs/rules.md

@@ -172,7 +172,8 @@ rules:
 
 Schema used to filter selected nodes.
 
-If a node was `select`ed but but does not match this schema, it will be skipped and the rule will check the next node.
+If a node was `select`ed but but does not match this schema, it will be skipped and the rule will move on to the next
+node.
 
 Uses [ajv syntax](https://ajv.js.org/keywords.html) in an object.
 

rules/grafana.yml

@@ -7,6 +7,8 @@ rules:
       - grafana
       - dashboard
 
+    # this is not the ideal selector for this rule, but tags are located at $.dashboard.tags, while notification
+    # channels are nested under $.dashboard.panels[*].alert.notifications[*].uid
     select: '$'
 
     filter:
@@ -41,7 +43,6 @@ rules:
                         items:
                           type: object
                           required: [uid]
-                          additionalProperties: false
                           properties:
                             uid:
                               type: string