Update cheatsheets

tldr/linux/gamescope

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gamescope
+
+> A micro-compositor used as a game layer.
+> More information: <https://github.com/ValveSoftware/gamescope>.
+
+- Run a program with gamescope:
+
+`gamescope -- {{command}}`
+
+- Upscale a 720p game to 1440p with integer scaling:
+
+`gamescope {{[-h|--nested-height]}} 720 {{[-H|--output-height]}} 1440 {{[-S|--scaler]}} integer -- %command%`
+
+- Limit a vsynced game to 30 FPS:
+
+`gamescope {{[-r|--nested-refresh]}} 30 -- %command%`
+
+- Toggle fullscreen:
+
+`<Super f>`
+
+- Show help:
+
+`gamescope --help`