Update cheatsheets

speed-test

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# speed-test
+
+> Test your internet connection speed and ping using <https://speedtest.net>.
+> More information: <https://github.com/sindresorhus/speed-test>.
+
+- Test your internet connection and ping speed:
+
+`speed-test`
+
+- Print the results as JSON:
+
+`speed-test --json`
+
+- Print the results in megabytes per second (MBps):
+
+`speed-test --bytes`
+
+- Print more detailed information:
+
+`speed-test --verbose`