Update docs for filtering

- Add additional details for [not] operator

Authored-by: Greg Cobb <gcobb@pivotal.io>

Author: Gerg

docs/v3/source/includes/concepts/_filters.md.erb

@@ -50,11 +50,11 @@ This will return all routes with hostname `"hostname1"`, `""` OR `"hostname2"`.
 
 Some fields (e.g. `created_at` and `updated_at`) can be filtered using relational operators when listing resources.
 
-For example, a response to `/v3/audit_events?created_ats[lt]=2020-06-30T12:34:56Z` will contain
+For example, a response to `GET /v3/audit_events?created_ats[lt]=2020-06-30T12:34:56Z` will contain
 audit events with a `created_at` timestamp strictly earlier than `2020-06-30T12:34:56Z`.
 
 Multiple relational operators can be combined to further refine the listed resources. For example, a
-response to `/v3/audit_events?created_ats[lt]=2020-01-02T00:00:00Z&created_ats[gt]=2019-12-31T23:59:59Z`
+response to `GET /v3/audit_events?created_ats[lt]=2020-01-02T00:00:00Z&created_ats[gt]=2019-12-31T23:59:59Z`
 will return all audit events occurring on New Year's Day.
 
 Timestamps must be in [standard timestamp format](#timestamps).
@@ -67,3 +67,14 @@ Timestamps must be in [standard timestamp format](#timestamps).
 **lte**      | Return resources less than or equal to the given value for the filtered attribute
 **gt**       | Return resources strictly greater than the given value for the filtered attribute
 **gte**      | Return resources greater than or equal to the given value for the filtered attribute
+
+#### Exclusion Operator (Experimental)
+
+Some fields support filtering on all values except a given set of values.
+
+For example, a response to `GET /v3/audit_events?target_guids[not]=guid-1,guid-2`
+will contain audit events with a `target.guid` not equal to `guid-1` nor `guid-2`.
+
+**Operator** | **Description**
+-------------|-----------------
+**not**      | Return resources not equal to the given value(s) for the filtered attribute

docs/v3/source/includes/resources/audit_events/_list.md.erb

@@ -31,7 +31,7 @@ Retrieve all audit events the user has access to.
 Name | Type | Description
 ---- | ---- | ------------
 **types** | _list of strings_ | Comma-delimited list of event types to filter by
-**target_guids** | _list of strings_ | Comma-delimited list of target guids to filter by. Also supports filtering by exclusion with `GET /v3/audit_events[not]=target-guid-one,target-guid-two`
+**target_guids** | _list of strings_ | Comma-delimited list of target guids to filter by. Also supports [filtering by exclusion](#exclusion-operator-experimental).
 **space_guids** | _list of strings_ | Comma-delimited list of space guids to filter by
 **organization_guids** | _list of strings_ | Comma-delimited list of organization guids to filter by
 **page** | _integer_ | Page to display; valid values are integers >= 1