Update arm_rfft_fast_f16.c

CMSIS/DSP/Source/TransformFunctions/arm_rfft_fast_f16.c

@@ -477,7 +477,7 @@ void merge_rfft_f16(
                    of the symmetry properties of the FFT and have a speed advantage over complex
                    algorithms of the same length.
   @par
-                   The Fast RFFT algorith relays on the mixed radix CFFT that save processor usage.
+                   The Fast RFFT algorithm relays on the mixed radix CFFT that save processor usage.
   @par
                    The real length N forward FFT of a sequence is computed using the steps shown below.
   @par
@@ -609,4 +609,4 @@ void arm_rfft_fast_f16(
 * @} end of RealFFT group
 */
 
-#endif /*  #if defined(ARM_FLOAT16_SUPPORTED) */
+#endif /*  #if defined(ARM_FLOAT16_SUPPORTED) */