Add volume toggle docs (#5077)

* Add volume toggle docs

* Change version and remove ref to another mod

* Changes as per review

* Fix numbers

docs/wiki/featurex/volume.md

@@ -0,0 +1,34 @@
+---
+layout: wiki
+title: Volume Toggle
+description: Ability to toggle volume of game and music.
+group: feature
+category: general
+parent: wiki
+mod: acex
+version:
+  major: 3
+  minor: 2
+  patch: 0
+---
+
+## 1. Overview
+
+Adds the possibility of setting a keybind to toggle volume of game and music. It's quite useful for when you're briefing in heavy rain, or if you're in an obnoxiously loud car.
+
+## 2. Features
+
+- Automatically lower volume when inside vehicles (restores when exiting vehicles)
+- Change reduction percentage and fade delay
+- Option to show/hide notification
+- Option to remind you every minute if your volume is lowered
+
+## 3. Usage
+
+1. Set the keybind in ACEX controls
+2. Enable the feature in ACE options
+3. Change the options to your liking
+
+## 4. Dependencies
+
+{% include dependenciesx_list.md component="volume" %}