Benchmarks: Remove duplicated bfloat16 comment

benchmarks/GPU/bench_gpu_elementwise.cu

diff --git a/benchmarks/GPU/bench_gpu_elementwise.cu b/benchmarks/GPU/bench_gpu_elementwise.cu
index eac1a71..1eea92d 100644
--- a/benchmarks/GPU/bench_gpu_elementwise.cu
+++ b/benchmarks/GPU/bench_gpu_elementwise.cu
@@ -155,7 +155,6 @@
 }  // namespace
 
 // bfloat16 has no device packet, so it is registered once, as the scalar path it is.
-// bfloat16 has no device packet, so it is registered once, as the scalar path it is.
 #define EIGEN_GPU_ELEMENTWISE_BENCHMARKS(NAME)                    \
   EIGEN_GPU_BENCHMARK_SIZES(NAME, float, Eigen::Aligned);         \
   EIGEN_GPU_BENCHMARK_SIZES(NAME, float, Eigen::Unaligned);       \