Update cheatsheets

valac

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# valac
+
+> Vala code compiler.
+> Tutorial: <https://wiki.gnome.org/Projects/Vala/Tutorial>.
+> More information: <https://valadoc.org/>.
+
+- Compile a vala file, with gtk+:
+
+`valac {{path/to/file.vala}} --pkg {{gtk+-3.0}}`
+
+- Display help:
+
+`valac --help`
+
+- Display version:
+
+`valac --version`