Update cheatsheets

mg

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mg
+
+> A small, fast, and portable text editor based on `emacs`.
+> More information: <https://github.com/hboetes/mg>.
+
+- Open a file for editing:
+
+`mg {{path/to/file}}`
+
+- Open a file at a specified line number:
+
+`mg +{{line_number}} {{path/to/file}}`
+
+- Open files in a read-only mode:
+
+`mg -R {{path/to/file1 path/to/file2 ...}}`
+
+- Disable `~` backup files while editing:
+
+`mg -n {{path/to/file}}`