docs: update outline for adding channel

pages/docs/concepts/asyncapidocument/adding-channels.md

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+---
+title: Adding Channels
+weight: 20
+---
+
+## Purpose of Channels
+
+- Explanation of how channels allow publishers and subscribers to communicate with each other.
+- Discussion of how channels facilitate decoupling between producers and consumers.
+- Explanation of how channels enable message routing in a publish-subscribe system.
+
+## Different Names for Channels
+
+- Overview of the various naming schemes that can be used for channels (e.g., topic, queue, stream).
+- Discussion of how these different naming schemes affect message delivery semantics.
+
+## Defining Channels
+
+- Explanation of how users can define channels in an AsyncAPI document.
+- Discussion of the various properties that can be specified for a channel (e.g., description, parameters, bindings).
+
+## Channel Availability on Specific Servers
+
+- Explain how a channel can be specified to be present only on certain servers using the servers field in the Channel Item Object (github.com)
+- Provide an example of defining a channel that is only available on specific servers (github.com)
+
+## Channel Parameters
+
+- Explain the use of parameters in channel names and how to define them in the AsyncAPI document (github.com)
+- Provide an example of a channel with parameters (github.com)
+
+## Example Channel
+
+- A simple example of a channel definition in an AsyncAPI document.
+- Explanation of how the channel relates to a server, and how it is expected to be present on all servers.
+- Discussion of how a channel can specify that it is only present on certain servers.
+
+## Conclusion
+
+- Recap of the importance of channels in AsyncAPI.
+- Final thoughts on best practices for defining channels in an AsyncAPI document.
+