update changelog numbers

Author: asiqurrahman

blogs/codedex-update-april-2025.mdx

@@ -86,7 +86,7 @@ Join [Sonny](https://www.codedex.io/@sonny) in our first-ever product update vid
 - ☕️ Published [Java Bonus Article](https://www.codedex.io/java/bonus/multi-file-compilation): Multi File Compilation.
 - ➕ Published [C++ Bonus Article](https://www.codedex.io/cpp/bonus/scope): Scope.
 - 🎨 Published [Create a Voice Virtual Assistant](https://www.codedex.io/projects/create-a-voice-virtual-assistant) project tutorial.
-- 🧹 Fixed numerous Code Challenge bug reports.
+- 🧹 Fixed 18 Code Challenge bug reports.
 
 **Product**