fix typo in link to parallel-threads blog post

Author: mflatt

blog/_src/posts/2025-11-22-racket-v9-0.md

@@ -10,7 +10,7 @@
 
 We are pleased to announce Racket v9.0 is now available from [https://download.racket-lang.org/](https://download.racket-lang.org).
 
-*** Racket 9.0 is here! ***
+**Racket 9.0 is here!**
 
 A major release is always exciting and Racket 9.0 is no exception in
 that it introduces Parallel Threads. While Racket has had green threads
@@ -19,7 +19,7 @@ parallel threads is a major addition.
 
 ## As of this release:
 
-- Racket supports parallel threads. [For more information see the new blog post on the topic.](https:/blog.racket-lang.org/2025/11/parallel-threads.html)
+- Racket supports parallel threads. [For more information see the new blog post on the topic.](https://blog.racket-lang.org/2025/11/parallel-threads.html)
     - Parallel threads can be created using the [`#:pool`](https://docs.racket-lang.org/reference/threads.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._thread%29%29) argument to thread creation.
     - Threads created with
       [`#:keep`](https://docs.racket-lang.org/reference/threads.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._thread%29%29)