Apply changes to the second sidebar

Author: Kordyjan

project/resources/referenceReplacements/sidebar.yml

@@ -148,6 +148,10 @@ subsection:
       - page: reference/experimental/cc.md
       - page: reference/experimental/tupled-function.md
   - page: reference/syntax.md
-  - page: reference/language-versions.md
+  - title: Language Versions
+    index: reference/language-versions/language-versions.md
+    subsection:
+      - page: reference/language-versions/source-compatibility.md
+      - page: reference/language-versions/binary-compatibility.md
   - page: reference/soft-modifier.md
   - page: reference/features-classification.md