Removes known issues from v4 upgrade guide

Author: samejr

docs/upgrade-to-v4.mdx

@@ -27,7 +27,7 @@ import NodeVersions from "/snippets/node-versions.mdx";
 
 ## How to migrate to v4
 
-First read the deprecations, breaking changes, and known issues sections below.
+First read the deprecations and breaking changes sections below.
 
 We recommend the following steps to migrate to v4:
 
@@ -87,10 +87,6 @@ pnpm dlx trigger.dev@v4-beta dev
 
 </CodeGroup>
 
-## Known issues
-
-During the beta we will be tracking issues and releasing regular fixes.
-
 ## Deprecations
 
 We've deprecated the following APIs: