Update cheatsheets

linux/grub-script-check

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grub-script-check
+
+> The program `grub-script-check` takes a GRUB script file and checks it for syntax errors.
+> It may take a path as a non-option argument. If none is supplied, it will read from `stdin`.
+> More information: <https://www.gnu.org/software/grub/manual/grub/html_node/Invoking-grub_002dscript_002dcheck.html>.
+
+- Check a specific script file for syntax errors:
+
+`grub-script-check {{path/to/grub_config_file}}`
+
+- Display each line of input after reading it:
+
+`grub-script-check --verbose`
+
+- Display help:
+
+`grub-script-check --help`
+
+- Display version:
+
+`grub-script-check --version`