Update cheatsheets

tldr/diff-so-fancy

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# diff-so-fancy
+
+> Colorize `diff` output in a more human readable way.
+> More information: <https://github.com/so-fancy/diff-so-fancy#-usage>.
+
+- Colorize `diff`:
+
+`diff {{[-u|--unified]}} {{path/to/file1}} {{path/to/file2}} | diff-so-fancy`
+
+- Set `diff-so-fancy` to colorize the output during Git's interactive staging:
+
+`git config --global interactive.diffFilter "diff-so-fancy --patch"`