Update cheatsheets

linux/pi

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pi
+
+> Compute decimal Archimedes' constant Pi.
+> More information: <https://manned.org/pi>.
+
+- Display 100 decimal digits of Archimedes' constant Pi:
+
+`pi`
+
+- Display a specified number of decimal digits of Archimedes' constant Pi:
+
+`pi {{number}}`
+
+- Display recommended readings:
+
+`pi --bibliography`
+
+- Display help:
+
+`pi --help`
+
+- Display version:
+
+`pi --version`