fix typo (NVIDIA#1279)

examples/12_gemm_bias_relu/gemm_bias_relu.cu

@@ -81,7 +81,7 @@ using ShapeMMAThreadBlock =
 // This code section describes tile size a warp will compute
 using ShapeMMAWarp = cutlass::gemm::GemmShape<64, 64, 32>;  // <- warp tile M = 64, N = 64, K = 32 
 // This code section describes the size of MMA op
-using ShapeMMAOp = cutlass::gemm::GemmShape<16, 8, 8>;  // <- MMA Op tile M = 8, N = 8, K = 4
+using ShapeMMAOp = cutlass::gemm::GemmShape<16, 8, 8>;  // <- MMA Op tile M = 16, N = 8, K = 8
 
 // This code section describes how threadblocks are scheduled on GPU
 using SwizzleThreadBlock = cutlass::gemm::threadblock::GemmIdentityThreadblockSwizzle<>;  // <- ??