Claude review: drm/doc: Document DRM_WEDGE_RECOVERY_COLD_RESET recovery method

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

The documentation is generally good. A few observations:

**Recovery script lacks error handling**

The example `cold-reset.sh` script does not check the return status of critical operations:
```sh
	echo 1 > /sys/bus/pci/devices/$DEVICE/remove
	echo 0 > /sys/bus/pci/slots/$SLOT/power
	sleep 2
	echo 1 > /sys/bus/pci/slots/$SLOT/power
```

If `remove` fails or `power` writes fail, the script continues silently. While this is an example script and not production code, adding basic error checks (`set -e` or explicit checks) would be good practice for documentation that users will copy.

**Minor: the "No slot found" case has no guidance**

```sh
    else
	echo "No slot found"
    fi
```

When no slot is found, the script gives no guidance on what to do. A comment suggesting a system-level power cycle or BMC-assisted reset would help operators.

**Table update is correct:**

```
    cold-reset      remove device + slot power cycle + rescan
```

This matches the `#define` comment from patch 2.

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