Update cheatsheets

linux/swapon

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# swapon
+
+> Enable devices and files for swapping.
+> Note: `path/to/file` can either point to a regular file or a swap partition.
+> More information: <https://manned.org/swapon>.
+
+- Show swap information:
+
+`swapon`
+
+- Enable a given swap area:
+
+`swapon {{path/to/file}}`
+
+- Enable all swap areas specified in `/etc/fstab` except those with the `noauto` option:
+
+`swapon --all`
+
+- Enable a swap partition by its label:
+
+`swapon -L {{label}}`