Update nrf_modem/doc/dect_clock_sync.rst

Co-authored-by: Divya S Pillai <91891495+divipillai@users.noreply.github.com>

Author: tokaivola

nrf_modem/doc/dect_clock_sync.rst

@@ -444,7 +444,7 @@ When using the reference output feature:
 API reference
 *************
 
-For detailed information about the clock synchronization API, including function prototypes, parameter descriptions, and data structures, refer to the header file:
+For detailed information about the clock synchronization API, including function prototypes, parameter descriptions, and data structures, see the :ref:`nrf_modem_dect_clock_sync` documentation.
 
 * :file:`nrf_modem_dect_clock_sync.h`