Update RollOffMode.yaml to add the mathematical formulas for RolloffM… (#935)

## Changes

Added the internal mathematical formulas for all of the RolloffMode
Enums, which allows the reader to easily replicate how sound volume is
calculated to replicate Roblox's Sound Systems

This was calculated using [these Rolloff
Formulas](https://www.desmos.com/calculator/g7izzry4ze)

These are useful as currently, you have to search online for these
formulas, with no official documentation for recreating them.

## Checks

By submitting your pull request for review, you agree to the following:

- [ X ] This contribution was created in whole or in part by me, and I
have the right to submit it under the terms of this repository's open
source licenses.
- [ X ] I understand and agree that this contribution and a record of it
are public, maintained indefinitely, and may be redistributed under the
terms of this repository's open source licenses.
- [ X ] To the best of my knowledge, all proposed changes are accurate.

---------

Author: RedrcknRbn

content/en-us/reference/engine/enums/RollOffMode.yaml

@@ -15,21 +15,26 @@ items:
   - name: Inverse
     summary: |
       Volume attenuates from `Class.Sound.RollOffMinDistance` in an inverse
-      manner. This option mirrors how sounds attenuate in the real world.
+      manner, mirroring how sounds attenuate in the real world.
+      This is done through `Class.Sound.RollOffMinDistance`/`distance`,
+      where `distance` is the `Datatype.Vector3.Magnitude` between the audio source and the audio listener.
     value: 0
     tags: []
     deprecation_message: ''
   - name: Linear
     summary: |
       Volume attenuates between `Class.Sound.RollOffMinDistance` and
       `Class.Sound.RollOffMaxDistance` with a linear relationship.
+      This is done through (`Class.Sound.RollOffMaxDistance`/`distance`)/(`Class.Sound.RollOffMaxDistance`-`Class.Sound.RollOffMinDistance`),
+      where `distance` is the `Datatype.Vector3.Magnitude` between the audio source and the audio listener.
     value: 1
     tags: []
     deprecation_message: ''
   - name: LinearSquare
     summary: |
       Volume attenuates between `Class.Sound.RollOffMinDistance` and
       `Class.Sound.RollOffMaxDistance` with a linear squared relationship.
+      This is done through squaring `Linear`.
     value: 2
     tags: []
     deprecation_message: ''
@@ -38,6 +43,7 @@ items:
       A hybrid model which follows the `Inverse` model when close to
       `Class.Sound.RollOffMinDistance` and the `LinearSquare` model when close
       to `Class.Sound.RollOffMaxDistance`.
+      This is done by taking the lesser of `Inverse` and `LinearSquare`.
     value: 3
     tags: []
     deprecation_message: ''