Fixup CUDA minver/maxver in Nix and docs

Author: danieldk

docs/writing-kernels.md

@@ -101,12 +101,12 @@ depends = [ "torch" ]
 
 ### `general.cuda`
 
-- `cuda-maxver`: the maximum CUDA toolkit version (inclusive). This option
+- `maxver`: the maximum CUDA toolkit version (inclusive). This option
   _must not_ be set under normal circumstances, since it can exclude Torch
   build variants that are [required for compliant kernels](https://github.com/huggingface/kernels/blob/main/docs/kernel-requirements.md).
   This option is provided for kernels that cause compiler errors on
   newer CUDA toolkit versions.
-- `cuda-minver`: the minimum required CUDA toolkit version. This option
+- `minver`: the minimum required CUDA toolkit version. This option
   _must not_ be set under normal circumstances, since it can exclude Torch
   build variants that are [required for compliant kernels](https://github.com/huggingface/kernels/blob/main/docs/kernel-requirements.md).
   This option is provided for kernels that require functionality only

lib/build.nix

@@ -76,8 +76,8 @@ rec {
     buildToml: buildSets:
     let
       backends' = backends buildToml;
-      minCuda = buildToml.general.cuda.cuda-minver or "11.8";
-      maxCuda = buildToml.general.cuda.cuda-maxver or "99.9";
+      minCuda = buildToml.general.cuda.minver or "11.8";
+      maxCuda = buildToml.general.cuda.maxver or "99.9";
       minTorch = buildToml.torch.minver or "2.0";
       maxTorch = buildToml.torch.maxver or "99.9";
       versionBetween =