doc fix

Author: TomAugspurger

changes/2863.feature.rst renamed to changes/2863.feature.md

@@ -3,5 +3,5 @@ Added GPU-accelerated Zstd Codec
 This adds support for decoding with the Zstd Codec on NVIDIA GPUs using the
 nvidia-nvcomp library.
 
-With ``zarr.config.enable_gpu()``, buffers will be decoded using the GPU
+With `zarr.config.enable_gpu()`, buffers will be decoded using the GPU
 and the output will reside in device memory.