Document internal version of function to fix lit error

The lit test compiles the code with -Wdocumentation set, so we need to
document the internal function so that -Wdocumentation doesn't throw
errors

Author: hdoc

clang/lib/Headers/amxcomplexintrin.h

@@ -62,8 +62,6 @@
 ///    The 2nd source tile. Max size is 1024 Bytes.
 #define _tile_cmmimfp16ps(dst, a, b) __builtin_ia32_tcmmimfp16ps(dst, a, b)
 
-;
-
 /// Perform matrix multiplication of two tiles containing complex elements and
 ///    accumulate the results into a packed single precision tile. Each dword
 ///    element in input tiles \a a and \a b is interpreted as a complex number
@@ -109,8 +107,24 @@
 ///    The 2nd source tile. Max size is 1024 Bytes.
 #define _tile_cmmrlfp16ps(dst, a, b) __builtin_ia32_tcmmrlfp16ps(dst, a, b)
 
-;
-
+/// Perform matrix multiplication of two tiles containing complex elements and
+///    accumulate the results into a packed single precision tile.
+///
+/// \param m
+///    The number of rows in the first tile and the number of rows in the result
+///    tile.
+/// \param n
+///    The number of columns in the second tile and the number of columns in the
+///    result tile.
+/// \param k
+///    The number of columns in the first tile and the number of rows in the
+///    second tile.
+/// \param dst
+///    Pointer to the destination tile where the result will be stored.
+/// \param src1
+///    Pointer to the first source tile.
+/// \param src2
+///    Pointer to the second source tile.
 static __inline__ _tile1024i __DEFAULT_FN_ATTRS_COMPLEX
 _tile_cmmimfp16ps_internal(unsigned short m, unsigned short n, unsigned short k,
                            _tile1024i dst, _tile1024i src1, _tile1024i src2) {