Documentation update

Author: christophe0606

Source/FilteringFunctions/arm_fir_init_q15.c

@@ -75,7 +75,7 @@
       {0.3, -0.3, 0, 0}.
   </pre>
                    <code>pState</code> points to the array of state variables.
-                   <code>pState</code> is of length <code>numTaps+blockSize</code>, when running on Cortex-M4 and Cortex-M3  and is of length <code>numTaps+blockSize-1</code>, when running on Cortex-M0 where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_fir_q15()</code>.
+                   <code>pState</code> is of length <code>numTaps+blockSize</code>, when ARM_MATH_DSP is defined. Otherwise, it is of length <code>numTaps+blockSize-1</code> where <code>blockSize</code> is the number of input samples processed by each call to <code>arm_fir_q15()</code>.
  
   @par          Initialization of Helium version
                    For Helium version the array of coefficients must be a multiple of 8 (8a) even if less