Fix the docs regarding S2S timeouts

- They were in msec, not seconds
- The new default for DNS timeout is 10000

doc/configuration/s2s.md

@@ -123,15 +123,15 @@ Specifies the order of IP address families to try when establishing an outgoing
 * **Default:** `10_000`
 * **Example:** `outgoing.connection_timeout = 5000`
 
-Timeout (in seconds) for establishing an outgoing S2S connection.
+Timeout (in milliseconds) for establishing an outgoing S2S connection.
 
 ### `s2s.dns.timeout`
 * **Scope:** local
 * **Syntax:** positive integer
-* **Default:** `10`
-* **Example:** `dns.timeout = 30`
+* **Default:** `10_000`
+* **Example:** `dns.timeout = 3000`
 
-Timeout (in seconds) for DNS lookups when opening an outgoing S2S connection.
+Timeout (in milliseconds) for DNS lookups when opening an outgoing S2S connection.
 
 ### `s2s.dns.retries`
 * **Scope:** local