Update comment

Author: tadeja

cpp/src/arrow/CMakeLists.txt

@@ -1107,7 +1107,7 @@ endif()
 
 if(ARROW_BUILD_BUNDLED_DEPENDENCIES)
   if(CMAKE_CROSSCOMPILING)
-    # Debug Pyodide loading (use previous order for cross builds)
+    # Undo PREPEND-reversed order to not break Pyodide side-module loading (GH-50774)
     list(REVERSE ARROW_BUNDLED_STATIC_LIBS)
   endif()
   arrow_car(_FIRST_LIB ${ARROW_BUNDLED_STATIC_LIBS})