Improve library documentation (#826)

* Improve the Command Service documentation

The following changes have been added to this PR:
•	Fix minor grammatical errors.
•	Capitalize terms such as Commands, Modules and such, as the context is specific to the lib.
•	Wrap methods and properties in code blocks.

The docs page currently has several issues that remains to be fixed.

1. 
```md
>[!WARNING]
>This article is out of date and has not been rewritten yet.
Information is not guaranteed to be accurate.
```

The docs doesn't necessarily seem "out of date" as the warning claims. The basics seem pretty relevant to the latest version of the lib.

2.
>“To manually load a module, invoke [CommandService.AddModuleAsync], by passing in the generic type of your module and optionally, a dependency map.”

The latter part of the sentence seems off. Where should the user pass the dependency map to? It seems to suggest that `AddModuleAsync` has an argument to pass the dependency to. If it is referring to `AddModuleAsync(Type type)`, then I feel like it should be clarified here - or perhaps change the wording of the sentence.

3.
>“First, you need to create an @System.IServiceProvider You may create your own IServiceProvider if you wish.” 

Any mention of @System.IServiceProvider is currently broken on the docs.

4.
>“Submodules are Modules that reside within another one. Typically, submodules are used to create nested groups (although not required to create nested groups).”

Clarification on the part after "although?"

5.
>“Finally, pass the map into the LoadAssembly method. Your modules will automatically be loaded with this dependency map.”

Where is this `LoadAssembly` method?

6.
```md
>[!NOTE]
>Preconditions can be applied to Modules, Groups, or Commands.
```

The docs should mention `ParameterPreconditionAttribute`'s existence.

* Update line breaks to comply with docs standard

* Change "you should..." to "instead, ..."

* Trim trailing spaces

* Change "inherits" to "inherit"

* Fix Context warning note and add ReplyAsync xref

* Fix broken xrefs

* Fix [Command Service] xref

* Fix consistency between TypeReaders and Preconditions returns

* Add missing semi-colons in ServiceProvider sample

* Change CommandContext to SocketCommandContext & change variable naming

* Cleanup TypeReader section

* Wrap [DontInject] in code block

* Fix commands docs linking in intro

* Improve Getting Started - Installation

- Fix character misalignment to comply with docs standard.
- Fix image numbering issues by moving the tooltips above some of the steps.
- Add codeblocks to search terms like `Discord.Net`.
- Remove broken `addons` reference.
- Specify `.NET 4.6.1` as `.NET Framework 4.6.1`.
- Minor cross-reference cleanup.

* Fix Getting Started - Intro

- Minor grammartical fixes.
- Wrap mentions of the methods, properties, and events in code block.
- Replace `Discord.Net` to `Discord.NET`.
- Fix steps numbering under `Creating a Discord Bot` and `Adding your bot to a server`.
- Change `Task-based Asynchronous Pattern ([TAP])` linking to mark the entire term instead.
- Change code block of `Pong!` to quotation mark instead.

* Fix cross references in Sending Voice

* Mention parameter precondition attribute

* Change `Discord.NET` to `Discord.Net` for consistency

* Wrap project names in code blocks & minor fixes in Terminology

* Change `add-ons` to `addons` for consistency

* Fix cross references in Logging

* Fix minor grammatical issues in "Working with Events"

* Missed a tilda

* Remove out-of-date warning in Commands

* Minor grammatical fixes for Entities

* Fix broken xref in Logging

* Adjust service collection sample

...according to f89aecb7bf (r141530227)

* Update Command Handler sample

- Update Main for C# 7.1.
- Inject CommandService and DiscordSocketClient into the service collection.
- Add Async suffix to asynchronous methods.

* Minor grammatical fixes in Events

* Revert 2 incorrect grammar corrections

* Revert async Main sample

* Add hardcode token notice in sample

* Fix missing method for Command Handler

* Modify module samples to use SocketCommandContext instead

* Emphasize CommandContext and SocketCommandContext

* Fix formatting for module sample

* Add SocketCommandContext for Groups sample

* Remove comma

* Fix DepMap sample formatting

* Replace [DontInject] with DontInjectAttribute with cross reference

* Remove connection logic note

There is no reason that this note should still be here since Ready event exists.

* Add a new warning message informing the users the existence of CommandService

* Make command handler private

excellent change

docs/guides/voice/sending-voice.md

@@ -17,7 +17,7 @@ when developing on .NET Core, this is where you execute `dotnet run`
 from; typically the same directory as your csproj).
 
 For Windows Users, precompiled binaries are available for your 
-convienence [here](https://discord.foxbot.me/binaries/)
+convienence [here](https://discord.foxbot.me/binaries/).
 
 For Linux Users, you will need to compile [Sodium] and [Opus] from 
 source, or install them from your package manager.
@@ -31,7 +31,7 @@ Joining a channel is the first step to sending audio, and will return
 an [IAudioClient] to send data with.
 
 To join a channel, simply await [ConnectAsync] on any instance of an
-@Discord.IVoiceChannel.
+@Discord.IAudioChannel.
 
 [!code-csharp[Joining a Channel](samples/joining_audio.cs)]
 
@@ -44,7 +44,7 @@ guild. To switch channels within a guild, invoke [ConnectAsync] on
 another voice channel in the guild.
 
 [IAudioClient]: xref:Discord.Audio.IAudioClient
-[ConnectAsync]: xref:Discord.IVoiceChannel#Discord_IVoiceChannel_ConnectAsync
+[ConnectAsync]: xref:Discord.IAudioChannel#Discord_IAudioChannel_ConnectAsync_Action_IAudioClient__
 
 ## Transmitting Audio
 
@@ -84,7 +84,7 @@ Channels should be left at `2`, unless you specified a different value
 for `-ac 2` when creating FFmpeg.
 
 [AudioOutStream]: xref:Discord.Audio.AudioOutStream
-[IAudioClient.CreatePCMStream]: xref:Discord.Audio.IAudioClient#Discord_Audio_IAudioClient_CreatePCMStream_System_Int32_System_Int32_System_Nullable_System_Int32__System_Int32_
+[IAudioClient.CreatePCMStream]: xref:Discord.Audio.IAudioClient#Discord_Audio_IAudioClient_CreateDirectPCMStream_Discord_Audio_AudioApplication_System_Nullable_System_Int32__System_Int32_
 
 Finally, audio will need to be piped from FFmpeg's stdout into your 
 AudioOutStream. This step can be as complex as you'd like it to be, but