docs: trusted_proxies support IPv6 ranges

Support for IPv6 ranges was added by https://github.com/nextcloud/server/pull/32615

Signed-off-by: Daniel Kesselberg <mail@danielkesselberg.de>

config/config.sample.php

@@ -2027,9 +2027,7 @@ $CONFIG = [
  * - IPv4 addresses, e.g. `192.168.2.123`
  * - IPv4 ranges in CIDR notation, e.g. `192.168.2.0/24`
  * - IPv6 addresses, e.g. `fd9e:21a7:a92c:2323::1`
- *
- * _(CIDR notation for IPv6 is currently work in progress and thus not
- * available yet)_
+ * - IPv6 ranges in CIDR notation, e.g. `2001:db8:85a3:8d3:1319:8a20::/95`
  *
  * When an incoming request's `REMOTE_ADDR` matches any of the IP addresses
  * specified here, it is assumed to be a proxy instead of a client. Thus, the
@@ -2288,9 +2286,9 @@ $CONFIG = [
  *
  * For instance, if the phone property should default to the private scope
  * instead of the local one:
- * 
+ *
  * ::
- * 
+ *
  * 	[
  * 	  \OCP\Accounts\IAccountManager::PROPERTY_PHONE => \OCP\Accounts\IAccountManager::SCOPE_PRIVATE
  * 	]