Update cheatsheets

linux/fstrim

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# fstrim
+
+> Discard unused blocks on a mounted filesystem.
+> Only supported by flash memory devices such as SSDs and microSD cards.
+> More information: <https://manned.org/fstrim>.
+
+- Trim unused blocks on all mounted partitions that support it:
+
+`sudo fstrim --all`
+
+- Trim unused blocks on a specified partition:
+
+`sudo fstrim {{/}}`
+
+- Display statistics after trimming:
+
+`sudo fstrim --verbose {{/}}`