Update cheatsheets

tldr/linux/eselect

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# eselect
+
+> Gentoo's multi-purpose configuration and management tool.
+> It consists of various modules that take care of individual administrative tasks.
+> More information: <https://wiki.gentoo.org/wiki/Eselect>.
+
+- Display a list of installed modules:
+
+`eselect`
+
+- View documentation for a specific module:
+
+`tldr eselect {{module}}`
+
+- Display a help message for a specific module:
+
+`eselect {{module}} help`