Update cheatsheets

tldr/linux/eselect-kernel

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# eselect kernel
+
+> An `eselect` module for managing the `/usr/src/linux` symlink.
+> More information: <https://wiki.gentoo.org/wiki/Eselect#Kernel>.
+
+- List available kernel symlink targets with their numbers:
+
+`eselect kernel list`
+
+- Set the `/usr/src/linux` symlink by name or number from the `list` command:
+
+`eselect kernel set {{name|number}}`
+
+- Show what the current kernel symlink points to:
+
+`eselect kernel show`
+
+- Set the kernel symlink to the currently running kernel:
+
+`eselect kernel update`