Update cheatsheets

linux/nmon

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nmon
+
+> A system administrator, tuner, and benchmark tool.
+> More information: <https://manned.org/nmon>.
+
+- Start `nmon`:
+
+`nmon`
+
+- Save records to file ("-s 300 -c 288" by default):
+
+`nmon -f`
+
+- Save records to file with a total of 240 measurements, by taking 30 seconds between each measurement:
+
+`nmon -f -s {{30}} -c {{240}}`