Update cheatsheets

luajit

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# luajit
+
+> A just-in-time compiler (JIT) for the Lua programming language.
+> See also: `lua`.
+> More information: <https://luajit.org/luajit.html>.
+
+- Start an interactive Lua shell:
+
+`luajit`
+
+- Execute a Lua script:
+
+`luajit {{path/to/script.lua}} {{--optional-argument}}`
+
+- Execute a Lua expression:
+
+`luajit -e '{{print("Hello World")}}'`