Update cheatsheets

nproc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nproc
+
+> Print the number of processing units (normally CPUs) available.
+> More information: <https://www.gnu.org/software/coreutils/nproc>.
+
+- Display the number of available processing units:
+
+`nproc`
+
+- Display the number of installed processing units, including any inactive ones:
+
+`nproc --all`
+
+- If possible, subtract a given number of units from the returned value:
+
+`nproc --ignore {{count}}`