Update cheatsheets

tldr/sfdk-emulator

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sfdk emulator
+
+> Maintains and controls emulators.
+> More information: <https://docs.sailfishos.org/Develop/Apps/#emulator>.
+
+- Display the installed emulators:
+
+`sfdk emulator list`
+
+- Start an emulator:
+
+`sfdk emulator start {{name}}`
+
+- Stop an emulator:
+
+`sfdk emulator stop {{name}}`
+
+- Display emulator status:
+
+`sfdk emulator status {{name}}`
+
+- Run an interactive shell on an emulator:
+
+`sfdk emulator exec {{emulator}}`