Update cheatsheets

linux/slop

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# slop
+
+> Get a selection of the screen.
+> More information: <https://github.com/naelstrof/slop>.
+
+- Wait for the user to make a selection and output its geometry to `stdout`:
+
+`slop`
+
+- Double click, rather than click and drag, to draw a selection:
+
+`slop -D`
+
+- Highlight the selection rather than outlining it:
+
+`slop -l`
+
+- Specify the output format:
+
+`slop -f {{format_string}}`
+
+- Specify the selection rectangle's color:
+
+`slop -c {{red}},{{green}},{{blue}},{{alpha}}`