Update cheatsheets

tldr/linux/growpart

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# growpart
+
+> Extend a partition in a disk or disk image to fill available space.
+> More information: <https://github.com/canonical/cloud-utils>.
+
+- Extend partition `n` from `sdX` to fill empty space until end of disk or beginning of next partition:
+
+`growpart {{/dev/sdX}} {{n}}`
+
+- Show what modifications would be made when growing partition `n` in a disk image:
+
+`growpart --dry-run {{/path/to/disk.img}} {{n}}`