Voice tutorials: add HA OS to prereqs (#29420)

- fix some typos

source/voice_control/create_wake_word.markdown

@@ -10,9 +10,9 @@ Depending on the word, training a model on your own wake word may take a few ite
 
 ## Prerequisites
 
-- latest version of Home Assistant
+- Latest version of Home Assistant, installed with the Home Assistant Operating System
 - [M5Stack ATOM Echo Development Kit](https://shop.m5stack.com/products/atom-echo-smart-speaker-dev-kit?ref=NabuCasa)
-- successfully completed the [$13 voice assistant for Home Assistant](/voice_control/thirteen-usd-voice-remote/) tutorial
+- Successfully completed the [$13 voice assistant for Home Assistant](/voice_control/thirteen-usd-voice-remote/) tutorial
 
 ## To create your own wake word
 

source/voice_control/thirteen-usd-voice-remote.markdown

@@ -9,9 +9,9 @@ your smart home. Issue commands and get responses!
 <lite-youtube videoid="ziebKt4XLZQ" videotitle="Wake word demo on $13 ATOM Echo in Home Assistant
 "></lite-youtube>
 
-## Required material
+## Prerequisites
 
-- Home Assistant 2023.10
+- Home Assistant 2023.10, installed with the Home Assistant Operating System
 - [Home Assistant Cloud](https://www.nabucasa.com) or a manually configured [Assist Pipeline](/voice_control/voice_remote_local_assistant)
 - The password to your 2.4&nbsp;GHz Wi-Fi network
 - Chrome (or a Chromium-based browser like Edge) on desktop (not Android/iOS)

source/voice_control/using_voice_assistants_overview.markdown

@@ -9,7 +9,7 @@ But you can make Assist the default digital assistant and [start it on an Androi
 
 You can also create your own [custom sentences](/voice_control/custom_sentences/#adding-a-custom-sentence-to-trigger-an-automation) to start an automation. For example, you could say "Clean the floor when I'm gone" to start the vacuum after you left your home zone. For the full list of new features and some videos, head over to the [chapter 3 blog post](/blog/2023/07/20/year-of-the-voice-chapter-3/) or watch the stream.
 
-<lite-youtube videoid="sXzItFksYFA" videotitle="Year of the Voice CHapter 3"></lite-youtube>
+<lite-youtube videoid="sXzItFksYFA" videotitle="Year of the Voice Chapter 3"></lite-youtube>
 
 While the video below does not include these latest changes, it gives a good overview of some of the basics.
 

source/voice_control/voice_remote_local_assistant.markdown

@@ -10,6 +10,10 @@ The speech-to-text option is [Whisper](https://github.com/openai/whisper). It's
 
 For text-to-speech we have developed [Piper](https://github.com/rhasspy/piper). Piper is a fast, local neural text-to-speech system that sounds great and is optimized for the Raspberry Pi 4. It supports [many languages](https://rhasspy.github.io/piper-samples/). On a Raspberry Pi, using medium quality models, it can generate 1.6s of voice in a second.
 
+## Prerequisites
+
+- Home Assistant Operating System
+
 ## Installing a local Assist pipeline
 
 For the quickest way to get your local Assist pipeline started, follow these steps:

source/voice_control/worlds-most-private-voice-assistant.markdown

@@ -1,5 +1,5 @@
 ---
-title: "World's Most Private Voice Assistant"
+title: "World's most private voice assistant"
 ---
 
 This tutorial will guide you to turn your old landline phone into the
@@ -104,6 +104,7 @@ You were able to control Home Assistant over the phone but it no longer works. W
 The [debug information](/voice_control/troubleshooting#view-debug-information) shows no runs.
 
 **Potential remedy**
+
 1. Log onto the Grandstream *Device Configuration* software.
 2. On the **Status** page, check if the **Hook** status changes from **On Hook** to **In Use** after you picked up the phone.
    ![Check the Grandstream status](/images/assist/grandstream-troubleshoot-10.png)