Update cheatsheets

who

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# who
+
+> Display who is logged in and related data (processes, boot time).
+> More information: <https://www.gnu.org/software/coreutils/who>.
+
+- Display the username, line, and time of all currently logged-in sessions:
+
+`who`
+
+- Display information only for the current terminal session:
+
+`who am i`
+
+- Display all available information:
+
+`who -a`
+
+- Display all available information with table headers:
+
+`who -a -H`