nrf_modem: doc: porting_guide: Semaphore update

Semaphores are required also for non-multithreaded access. Remove
the statement that "Semaphores are not required if multithreaded access
to modem functionality is not needed. In this case, the function can
blindly return 0."

Signed-off-by: Eivind Jølsgard <[email protected]>

nrf_modem/doc/ug_nrf_modem_porting_os.rst

@@ -243,10 +243,6 @@ This function is called by the library to allocate and initialize a semaphore.
 * Allocate and initialize a semaphore.
 * If the address of an already allocated semaphore is provided as an input, the allocation part is skipped and the semaphore is only reinitialized.
 
-.. note::
-   Semaphores are not required if multithreaded access to modem functionalities is not needed.
-   In this case, the function must blindly return ``0``.
-
 nrf_modem_os_sem_give()
 -----------------------
 
@@ -392,8 +388,6 @@ You can use it as a starting point and customize it for your OS or scheduler.
          * and initialize a semaphore and return its address through the `sem` parameter. If the
          * address of an already allocated semaphore is provided as an input, the allocation part is
          * skipped and the semaphore is only reinitialized.
-         * Semaphores are not required if multithreaded access to modem functionalities is not
-         * needed. In this case, the function must blindly return ``0``.
          */
         return 0;
     }