Update extensions-defold-sdk.md

docs/en/manuals/extensions-defold-sdk.md

@@ -28,4 +28,4 @@ The header file is not publicly published but all of the available SDK functions
 * [Mutex](/ref/dmMutex/) - API for platform independent mutex synchronization primitive
 * [Script](/ref/dmScript/) - Built-in scripting functions.
 * [Shared Library](/ref/sharedlibrary/) - Utility functions for shared library export/import
-* [Sony vector Math Library](assets/Vector_Math_Library-Overview.pdf) - The Sony Vector Math library mainly provides functions used in 3-D graphics for 3-D and 4-D vector operations, matrix operations, and quaternion operations.
+* [Sony vector Math Library](/manuals/assets/Vector_Math_Library-Overview.pdf) - The Sony Vector Math library mainly provides functions used in 3-D graphics for 3-D and 4-D vector operations, matrix operations, and quaternion operations.