Remove promise of a future blog post. (#381)

Author: al45tair

_posts/2023-08-29-swift-5.9-released.md

@@ -97,8 +97,6 @@ On Linux, the Swift runtime will now catch program crashes and Swift runtime err
 
 This feature is also available on macOS, although there it is disabled by default (it can be enabled by setting `SWIFT_BACKTRACE=enable=yes`) and you need to ensure that your program is signed with the `com.apple.security.get-task-allow` entitlement.
 
-A more detailed blog covering this feature will be published soon.
-
 ### Debugging
 
 In Swift 5.9, we introduced a couple of new features to [LLDB](https://lldb.llvm.org/) and the Swift compiler aimed at making Swift debugging faster and more reliable.