Call update_known_user_cache() right before "Client connecting" log.

This is after PRE_LOCAL_CONNECT hook and can be useful in case some
module in there did something to the user that made them known-users.

And mention explicitly to module devs if they have things like
authentication mods that may move users between known<->unknown
that they should update the cache.

doc/RELEASE-NOTES.md

@@ -9,8 +9,18 @@ This is work in progress and may not always be a stable version.
 ### Changes:
 
 ### Fixes:
+* Harden the built-in HTTPS client
 
 ### Developers and protocol:
+* URL API: The OutgoingWebRequest `max_size` (introduced last release) now
+  also caps file-backed downloads. Default for file-backed when left at 0
+  is 50MB (`DOWNLOAD_MAX_SIZE_FILE_BACKED`). For memory-backed, it stays
+  at 1MB like in 6.2.5 (`DOWNLOAD_MAX_SIZE_MEMORY_BACKED`).
+* If you do something to a user that would (potentially) move the user from
+  `unknown-users` to `known-users` (or vice versa) then you should call
+  `update_known_user_cache(client);` to update the known users cache.
+  For example, if you have some authentication module that marks a user
+  as IsLoggedIn.
 
 UnrealIRCd 6.2.5
 -----------------

src/modules/nick.c

@@ -1185,6 +1185,8 @@ int _register_user(Client *client)
 
 	safe_free(client->local->passwd);
 
+	update_known_user_cache(client);
+
 	unreal_log(ULOG_INFO, "connect", "LOCAL_CLIENT_CONNECT", client,
 		   "Client connecting: $client ($client.user.username@$client.hostname) [$client.ip] $extended_client_info",
 		   log_data_string("extended_client_info", get_connect_extinfo(client)));