docs: Revise Apple VideoToolbox article.

source/docs/en/latest/table-of-contents.markdown

@@ -141,7 +141,7 @@ Table of contents
   - [Intel QuickSync Video (QSV) options](technical/video-qsv-options.html)<span class="notice draft"><span>draft</span></span>
   - [AMD VCE](technical/video-vce.html)<span class="notice draft"><span>draft</span></span>
   - [NVidia NVENC](technical/video-nvenc.html)<span class="notice draft"><span>draft</span></span>
-  - [Apple Video Toolbox](technical/video-videotoolbox.html) <span class="notice draft"><span>draft</span></span>
+  - [Apple VideoToolbox](technical/video-videotoolbox.html)<span class="notice draft"><span>draft</span></span>
 - Audio
   - [Dynamic range compression](technical/dynamic-range-compression.html)<span class="notice draft"><span>draft</span></span>
   - [Audio quality](technical/audio-quality.html)<span class="notice draft"><span>draft</span></span>

source/docs/en/latest/technical/video-videotoolbox.markdown

@@ -1,13 +1,13 @@
 ---
 Type:            article
 State:           [ draft ]
-Title:           Apple VideoToolbox Encoder
+Title:           Apple VideoToolbox
 Project:         HandBrake
 Project_URL:     https://handbrake.fr/
 Project_Version: Latest
 Language:        English
 Language_Code:   en
-Authors:         [ Scott (s55) ]
+Authors:         [ Bradley Sepos <bradley@bradleysepos.com> (BradleyS), Scott (s55) ]
 Copyright:       2019 HandBrake Team
 License:         Creative Commons Attribution-ShareAlike 4.0 International
 License_Abbr:    CC BY-SA 4.0
@@ -15,33 +15,29 @@ License_URL:     https://handbrake.fr/docs/license.html
 ---
 
 Apple VideoToolbox
-==========================
+==================
 
-Supported Hardware and Configurations 
+## Supported hardware
---------------
-- Most 2015 or later Mac Computers
 
-Please note, these are not hard limits and the feature *may* work on older series and operating systems, but this is not officially supported.
+- Most 2015 or later Macs
+
+Please note, these are not hard limits. Hardware encoding via VideoToolbox *might* work on older series GPUs and older operating systems, but this is not officially supported.
+
+## Enabling support
+
+If your computer is supported you will see one or more of the following video encoders added to the encoder control on the `Video` tab.
 
-Enabling support
---------------
-If your computer is supported you will see the following video encoders added to the dropdown on the "Video" tab.
 - H.264 (VideoToolbox)
 - H.265 (VideoToolbox)
 
-Choice of the underlying hardware encoder (Intel QuickSync or AMD VCE) is not available. The highest quality option will typically be chosen)
+Choice of the underlying hardware encoder (AMD VCE or Intel QuickSync Video) is not available. The highest quality option will typically be chosen.
 
+## Performance
 
-Performance
+Only video encoding is performed by the hardware encoder. Every stage prior to and after video encoding including decoding, filters, audio/video sync, audio encoding, muxing, etc., is performed by the CPU. As a result, it is normal to have high (even 100%) CPU utilisation during encodes.
---------------
-Take note that only the encode portion of the encode pipeline is done on hardware. 
-Every stage prior and after in the pipeline including (decoding, filters, a/v sync, muxing etc.) all happen on the CPU. As a result, it is normal to have high, or 100% CPU utilisation during encodes. 
 
-It is common, particularly on lower end hardware that the CPU may be a bottleneck for the encoder. To minimise this effect, turn off any filters that you do not require. 
+It is common, particularly on lower-end hardware, for the CPU to be a bottleneck for the hardware video encoder. To minimise this effect, disable any filters that you do not require.
 
+## Advanced options
 
-Advanced Options
+There are no advanced options available for VideoToolbox encoders.
---------------
-
-There are no advanced options available for this encoder.
-