Update cheatsheets

tldr/chroot

@@ -8,10 +8,14 @@ source: https://github.com/tldr-pages/tldr.git
 > Run command or interactive shell with special root directory.
 > More information: <https://www.gnu.org/software/coreutils/manual/html_node/chroot-invocation.html>.
 
+- Run `$SHELL` in the new root directory:
+
+`sudo chroot {{path/to/new_root}}`
+
 - Run command as new root directory:
 
 `sudo chroot {{path/to/new_root}} {{command}}`
 
 - Use a specific user and group:
 
-`sudo chroot --userspec {{username_or_id:group_name_or_id}}`
+`sudo chroot --userspec {{username_or_id}}:{{group_name_or_id}} {{path/to/new_root}}`