[docs] Message Forwards feature (discord#6818)

Add documentation for message forwards.

A message forward gives users the ability to send a snapshot of a message in one channel to another channel.
- snapshots are immutable, and do not receive updates from the original message (unlike replies)
- similar to a REPLY message, a forward is created using a `message_reference`

[DDevs #api-announcement](https://canary.discord.com/channels/613425648685547541/697138785317814292/1233463756160503859) - thread there

# Examples

## Creates
```json
{
    message_reference": {
        "type": 1,  // FORWARD
        "message_id": "123456789012345678",
        "channel_id": "123456789012345678",
        "guild_id": "123456789012345678"
    },
}
```

## Responses
```json
{
    "author": {
        "id": 123456789012345678,
    },
    "message_reference": {
        "type": 1,  // FORWARD
        "message_id": "123456789012345678",
        "channel_id": "123456789012345678",
        "guild_id": "123456789012345678"
    },
    "message_snapshots": [
        {
            "content": "hello world",
            "embeds": [
                // Embed objects
            ],
            "attachments": [
                // Attachment objects
            ]
        }
    ]
}
```

Author: lytefast

docs/interactions/Receiving_and_Responding.md

@@ -153,7 +153,7 @@ All options have names, and an option can either be a parameter and input value-
 This is sent on the [message object](#DOCS_RESOURCES_CHANNEL/message-object) when the message is a response to an Interaction without an existing message.
 
 > info
-> This means responses to [Message Components](#DOCS_INTERACTIONS_MESSAGE_COMPONENTS/) do not include this property, instead including a [message reference](#DOCS_RESOURCES_CHANNEL/message-reference-object-message-reference-structure) object as components _always_ exist on preexisting messages.
+> This means responses to [Message Components](#DOCS_INTERACTIONS_MESSAGE_COMPONENTS/) do not include this property, instead including a [message reference](#DOCS_RESOURCES_CHANNEL/message-reference-structure) object as components _always_ exist on preexisting messages.
 
 ###### Message Interaction Structure