Add to Allow and Block action list

Author: maxvp

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

@@ -63,6 +63,7 @@ API value: `allow`
 - [Resolved Continent IP Geolocation](#resolved-continent)
 - [Resolved Country IP Geolocation](#resolved-country)
 - [Resolved IP](#resolved-ip)
+- [Request Context Categories](#request-context-categories)
 - [Security Categories](#security-categories)
 - [Source Continent IP Geolocation](#source-continent)
 - [Source Country IP Geolocation](#source-country)
@@ -114,6 +115,7 @@ API value: `block`
 - [Resolved Continent IP Geolocation](#resolved-continent)
 - [Resolved Country IP Geolocation](#resolved-country)
 - [Resolved IP](#resolved-ip)
+- [Request Context Categories](#request-context-categories)
 - [Security Categories](#security-categories)
 - [Source Continent IP Geolocation](#source-continent)
 - [Source Country IP Geolocation](#source-country)