Update cheatsheets

sl

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sl
+
+> Steam locomotive running through your terminal.
+> More information: <https://github.com/mtoyoda/sl>.
+
+- Let a steam locomotive run through your terminal:
+
+`sl`
+
+- The train burns, people scream:
+
+`sl -a`
+
+- Let the train fly:
+
+`sl -F`
+
+- Make the train little:
+
+`sl -l`
+
+- Let the user exit (CTRL + C):
+
+`sl -e`