Remove outdated channel switching guidance

Author: caesay

docs/packaging/channels.mdx

@@ -13,7 +13,7 @@ For legacy purposes, Velopack will also generate a `RELEASES` file (for the `win
 ## Switching channels in installed apps
 It is often desirable to allow users to switch channels easily. For example, if your users downloaded an installer for a "stable" version of your app, they will only receive updates for the "stable" channel. Later on, they decide they wish to switch to the "beta" channel to try some experimental features in your app. 
 
-This can be done by supplying a non-null channel argument to the UpdateManager constructor. So you would instantiate as `new UpdateManager("https://the.place/you-store/updates", "beta")` and then perform an update process as usual.
+[Read more on how to switch channels here.](../integrating/switching-channels.mdx)
 
 ## Deploying cross-platform apps