Update cheatsheets

tldr/linux/systool

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# systool
+
+> View system device information by bus, and classes.
+> This command is part of the `sysfs` package.
+> More information: <https://github.com/linux-ras/sysfsutils>.
+
+- List all attributes of devices of a bus (eg. `pci`, `usb`). View all buses using `ls /sys/bus`:
+
+`systool -b {{bus}} -v`
+
+- List all attributes of a class of devices (eg. `drm`, `block`). View all classes using `ls /sys/class`:
+
+`systool -c {{class}} -v`
+
+- Show only device drivers of a bus (eg. `pci`, `usb`):
+
+`systool -b {{bus}} -D`