Update cheatsheets

clear

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# clear
+
+> Clears the screen of the terminal.
+> More information: <https://manned.org/clear>.
+
+- Clear the screen (equivalent to pressing Control-L in Bash shell):
+
+`clear`
+
+- Clear the screen but keep the terminal's scrollback buffer:
+
+`clear -x`
+
+- Indicate the type of terminal to clean (defaults to the value of the environment variable `TERM`):
+
+`clear -T {{type_of_terminal}}`
+
+- Display the version of `ncurses` used by `clear`:
+
+`clear -V`