docs: further tweaks to multi-backend alpha docs

docs/source/installation.mdx

@@ -217,10 +217,13 @@ For each supported backend, follow the respective instructions below:
 
 <hfoptions id="backend">
 <hfoption id="AMD ROCm">
+
 > [!WARNING]
 > Pre-compiled binaries are only built for ROCm versions `6.1.0`/`6.1.1`/`6.1.2`/`6.2.0` and `gfx90a`, `gfx942`, `gfx1100` GPU architectures. [Find the pip install instructions here](#multi-backend-pip).
 >
 > Other supported versions that don't come with pre-compiled binaries [can be compiled for with these instructions](#multi-backend-compile).
+>
+> **Windows is not supported for the ROCm backend**; also not WSL2 to our knowledge.
 
 > [!TIP]
 > If you would like to install ROCm and PyTorch on bare metal, skip the Docker steps and refer to ROCm's official guides at [ROCm installation overview](https://rocm.docs.amd.com/projects/install-on-linux/en/latest/tutorial/install-overview.html#rocm-install-overview) and [Installing PyTorch for ROCm](https://rocm.docs.amd.com/projects/install-on-linux/en/latest/how-to/3rd-party/pytorch-install.html#using-wheels-package) (Step 3 of wheels build for quick installation). Special note: please make sure to get the respective ROCm-specific PyTorch wheel for the installed ROCm version, e.g. `https://download.pytorch.org/whl/nightly/rocm6.2/`!
@@ -276,7 +279,6 @@ pip install --force-reinstall 'https://github.com/bitsandbytes-foundation/bitsan
 </hfoption>
 <hfoption id="Mac">
 
-
 > [!WARNING]
 > bitsandbytes does not yet support Apple Silicon / Metal with a dedicated backend. However, the build infrastructure is in place and the below pip install will eventually provide Apple Silicon support as it becomes available on the `multi-backend-refactor` branch based on community contributions.