Learn Editor: Update arm64-intrinsics.md

Author: jacabuch

docs/intrinsics/arm64-intrinsics.md

@@ -131,6 +131,8 @@ NEON intrinsics are supported, as provided in the header file *arm64_neon.h*. Th
 |_CountLeadingSigns64||unsigned int _CountLeadingSigns64(\__int64)|
 |_CountLeadingZeros||unsigned int _CountLeadingZeros(unsigned long)|
 |_CountLeadingZeros64||unsigned int _CountLeadingZeros64(unsigned \__int64)|
+|_CountTrailingZeros||unsigned int _CountTrailingZeros(unsigned long)|
+|_CountTrailingZeros64||unsigned int _CountTrailingZeros64(unsigned __int64)|
 |_CountOneBits||unsigned int _CountOneBits(unsigned long)|
 |_CountOneBits64||unsigned int _CountOneBits64(unsigned \__int64)|
 |_ReadStatusReg|MRS|\__int64 _ReadStatusReg(int)|