doc: fix formatting

Author: araujogui

doc/api/repl.md

@@ -6,6 +6,7 @@
 llm_description: >
   Provides an interactive Read-Eval-Print-Loop (REPL) implementation.
 -->
+
 > Stability: 2 - Stable
 
 <!-- source_link=lib/repl.js -->

doc/api/worker_threads.md

@@ -8,6 +8,7 @@ llm_description: >
   useful for performing CPU-intensive operations without blocking the main
   application's event loop.
 -->
+
 > Stability: 2 - Stable
 
 <!-- source_link=lib/worker_threads.js -->