Add additional context

Author: maxvp

src/content/docs/cloudflare-one/policies/gateway/dns-policies/common-policies.mdx

@@ -68,9 +68,17 @@ The categories included in this policy are not always a security threat, but blo
 	product="cloudflare-one"
 />
 
-## Block dynamic list of categories
+## Block a dynamic list of categories
 
-Block a set of categories sent in the EDNS section of the request. The integer category list to block on, can be sent to the gateway DNS as JSON(`{"categories": [<category-int-codes..>]}`) via OPT code 65050. This is useful to filter by categories, that are not known at the time of creating a rule. Whenever a DNS request is blocked because of the request context categories, gateway will reply with an EDE Blocked(15) field containing an array of matched categories.
+You can block a set of categories sent in the [EDNS](https://datatracker.ietf.org/doc/html/rfc6891) portion of a request with the [Request Context Categories](/cloudflare-one/policies/gateway/dns-policies/#request-context-categories) selector. The category ID list to block on can be sent to the gateway DNS as JSON using OPT code `65050`. For example:
+
+```json
+{
+	"categories": [2, 67, 125, 133]
+}
+```
+
+This is useful to filter by categories that are not known at the time of creating a rule. When a DNS request is blocked because of the request context categories, Gateway will reply with an EDE Blocked(15) field containing an array of the matched categories.
 
 <Tabs syncKey="dashPlusAPI"> <TabItem label="Dashboard">
 

src/content/docs/cloudflare-one/policies/gateway/dns-policies/index.mdx

@@ -394,7 +394,7 @@ Use this selector to filter based on the IP addresses that the query resolves to
 
 ### Request Context Categories
 
-Use this selector to match a dynamic list of [category IDs](/cloudflare-one/policies/gateway/domain-categories/#category-and-subcategory-ids) sent in the EDNS portion of a DNS query. Gateway includes request context with the OPT code `65050`.
+Use this selector to match a dynamic list of [category IDs](/cloudflare-one/policies/gateway/domain-categories/#category-and-subcategory-ids) sent in the [EDNS](https://datatracker.ietf.org/doc/html/rfc6891) portion of a DNS query. Gateway includes request context with the OPT code `65050`.
 
 | UI name                    | API example                                                           | Evaluation phase      |
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