docs: document CUDA crash dump output (#31333)

Co-authored-by: Xinyuan Tong <xinyuantong.cs@gmail.com>

docs_new/docs/advanced_features/server_arguments.mdx

@@ -840,7 +840,7 @@ Please consult the documentation below and [server_args.py](https://github.com/s
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       <td style={{padding: "9px 12px", fontWeight: 500, backgroundColor: "rgba(255,255,255,0.02)"}}>`--crash-dump-folder`</td>
-      <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.05)"}}>Folder path to dump requests from the last 5 min before a crash (if any). If not specified, crash dumping is disabled.</td>
+      <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.05)"}}>Folder for crash diagnostics. Stores completed requests retained by the crash-dump buffer plus in-flight requests and, on NVIDIA CUDA, configures device coredumps under this folder. Existing CUDA coredump environment variables take precedence. If not specified, this option does not enable request crash dumping or set CUDA coredump defaults.</td>
       <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.02)"}}>`None`</td>
       <td style={{padding: "9px 12px", backgroundColor: "rgba(255,255,255,0.05)"}}>Type: str</td>
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