Update cheatsheets

tldr/linux/mhwd-kernel

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mhwd-kernel
+
+> Manage and install Linux kernels in Manjaro.
+> More information: <https://wiki.manjaro.org/index.php/Manjaro_Kernels>.
+
+- List all available kernels:
+
+`mhwd-kernel {{[-l|--list]}}`
+
+- List all installed kernels:
+
+`mhwd-kernel {{[-li|--listinstalled]}}`
+
+- Install a kernel:
+
+`sudo mhwd-kernel {{[-i|--install]}} {{kernel}}`
+
+- Remove a kernel:
+
+`sudo mhwd-kernel {{[-r|--remove]}} {{kernel}}`
+
+- Install a kernel, replacing the currently running kernel:
+
+`sudo mhwd-kernel {{[-i|--install]}} {{kernel}} rmc`