Update a bunch of links to point to both v3 and v4 docs.

docs/faq.md

@@ -12,7 +12,7 @@ The number of users you can support per-server is dependent on your chosen modul
 
 ### How do I get prefixes like `%`, `~`, and `&`?
 
-These prefixes are provided by the customprefix module. You should load this module and then define the appropriate `<customprefix>` tags to add those prefixes ([v3 docs](/3/modules/customprefix)).
+These prefixes are provided by the customprefix module. You should load this module and then define the appropriate `<customprefix>` tags to add those prefixes ([v4 docs](/4/modules/customprefix), [v3 docs](/3/modules/customprefix)).
 
 ### How do I start InspIRCd when the system boots?
 
@@ -53,11 +53,11 @@ Common services packages used with InspIRCd are:
 
 Server operators do not automatically get channel privileges by default. You can change this by:
 
-- Giving server operators a channel status using the operprefix module ([v3 docs](/3/modules/operprefix)).
+- Giving server operators a channel status using the operprefix module ([v4 docs](/4/modules/operprefix), [v3 docs](/3/modules/operprefix)).
 
-- Overriding your lack of privileges using the override module ([v3 docs](/3/modules/override)).
+- Overriding your lack of privileges using the override module ([v4 docs](/4/modules/override), [v3 docs](/3/modules/override)).
 
-- Giving yourself channel operator status using the samode module ([v3 docs](/3/modules/samode)).
+- Giving yourself channel operator status using the samode module ([v4 docs](/4/modules/samode), [v3 docs](/3/modules/samode)).
 
 ### Why does my server tell me "An unexpected TLS packet was received" or "error:1408F10B:SSL routines:ssl3_get_record:wrong version number:ssl/record/ssl3_record.c" when I try to connect using SSL/TLS?
 
@@ -81,7 +81,7 @@ This bug is known to be fixed in:
 - WeeChat v2.5 (released June 2019).
 - ZNC 1.8 (released May 2020).
 
-If you want to warn users to upgrade their client you can install the clientcheck contrib module via the [Module Manager](/3/module-manager) and use the following config:
+If you want to warn users to upgrade their client you can install the clientcheck contrib module via the Module Manager ([v4 docs](/4/module-manager), [v3 docs](/3/module-manager)) and use the following config:
 
 ```xml
 <module name="clientcheck">

docs/server/_dev.md

@@ -1,7 +1,7 @@
 <!-- This file contains a page fragment. Any changes will affect all pages that include it. -->
 
 !!! note ""
-    This page is intended for developers. If you're looking information on for how to link servers you should refer to [the spanningtree module](/3/modules/spanningtree) page instead.
+    This page is intended for developers. If you're looking information on for how to link servers you should refer to the spanningtree module ([v4 docs](/4/modules/spanningtree), [v3 docs](/3/modules/spanningtree)) page instead.
 
 !!! warning ""
     Documentation of the server protocol is still work in progress. It may be incomplete or inaccurate.

docs/server/messages/index.md

@@ -16,7 +16,7 @@ Messages are formatted the same as [a standard IRCv3 message](https://ircv3.net/
 
 ## Messages
 
-This page only lists server messages. For details on user commands that may be sent across the network see [the core commands page](/3/commands) or for a specific module please refer to [the appropriate page for that module](/3/modules).
+This page only lists server messages. For details on user commands that may be sent across the network see the core commands page ([v4 docs](/4/commands), [v3 docs](/3/commands)) or for a specific module please refer to the appropriate page for that module ([v4 docs](/4/modules), [v3 docs](/3/modules)).
 
 <table markdown="1">
 <thead>

docs/server/messages/snonotice.yml

@@ -1,7 +1,7 @@
 name: SNONOTICE
 syntax:
   fields:
-    snochar: The [server notice character](/3/snomasks) that the message is associated with.
+    snochar: The server notice character ([v4 docs](/4/snomasks), [v3 docs](/3/snomasks)) that the message is associated with.
     message: The message to send to server operators.
   text: |-
     <snochar> :<message>