clear: add -x, -T and -V examples (#3684)

Co-authored-by: Zlatan Vasović <zlatanvasovic@gmail.com>
Co-authored-by: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>

pages/common/clear.md

@@ -2,6 +2,18 @@
 
 > Clears the screen of the terminal.
 
-- Clear the screen (equivalent to typing Control-L when using the bash shell):
+- 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}}`
+
+- Show the version of `ncurses` used by `clear`:
+
+`clear -V`