Update cheatsheets

tldr/sfdk-check

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sfdk check
+
+> Performs quality checks.
+> More information: <https://docs.sailfishos.org/Develop/Apps/Tutorials/Building_packages_-_advanced_techniques/#validating-package-contents>.
+
+- Display test suites:
+
+`sfdk check --list-suites`
+
+- Run all or essential test suites:
+
+`sfdk check`
+
+- Add testing level to the check:
+
+`sfdk check -l +{{level}}`
+
+- Remove testing level from the check:
+
+`sfdk check -l -{{level}}`
+
+- Add testing suite to the check:
+
+`sfdk check -s +{{suite}}`
+
+- Remove testing suite from the check:
+
+`sfdk check -s -{{suite}}`