Add DoH procedure

Author: maxvp

src/content/docs/cloudflare-one/connections/connect-devices/agentless/dns/dns-over-https.mdx

@@ -13,7 +13,7 @@ Location-based policies require that you send DNS requests to a [location-specif
 
 ## Filter DoH requests by location
 
-Location-based policies require that you send DNS requests to a unique <GlossaryTooltip term="DoH subdomain">DoH endpoint</GlossaryTooltip> assigned to the location:
+Location-based policies require that you send DNS queries to a unique <GlossaryTooltip term="DoH subdomain">DoH endpoint</GlossaryTooltip> assigned to the location:
 
 ```txt
 https://<YOUR_DOH_SUBDOMAIN>.cloudflare-gateway.com/dns-query
@@ -105,6 +105,17 @@ For more information, refer to [Microsoft's DoH guide](https://learn.microsoft.c
 
 </Details>
 
+### Use generic DoH endpoint
+
+You can send DoH requests to the generic Cloudflare DoH endpoint. To specify a location in your DoH query, include a header named `cf-dns-location` with a value of your location's DoH subdomain. For example:
+
+```http
+GET /dns-query?name=example.com&type=A HTTP/2
+Host: dns.cloudflare-gateway.com
+cf-dns-location: 9y65g5srsm
+Accept: application/dns-message
+```
+
 ## Filter DoH requests by user
 
 In order to filter DoH queries based on user identity, each query must include a user-specific authentication token. If you have several devices per user and want to apply device-specific policies, you will need to map each device to a different email.

src/content/docs/cloudflare-one/connections/connect-devices/agentless/dns/dns-over-tls.mdx

@@ -30,7 +30,7 @@ Hostname: 9y65g5srsm.cloudflare-gateway.com
 IP address: 162.159.36.5
 ```
 
-Alternatively, you can use the generic DoT endpoint (`dns.cloudflare-gateway.com`) and include an `OPT` record with code `65011` and value of your location name. For example:
+Alternatively, you can use the generic DoT endpoint (`dns.cloudflare-gateway.com`) and include an `OPT` record with code `65011`. You can select a specific location for the value of the `OPT` record. For example:
 
 ```txt
 Hostname: dns.cloudflare-gateway.com