docs: replace redirection with tee command with sudo for file creation

[vostok92]

This pull request addresses an issue where using sudo-prefixed echo does not grant elevated permissions for the subsequent redirection operation, resulting in a failure to write files under /etc/apt. By replacing the redirection with a sudo-prefixed tee command, this change ensures that files are written with root privileges, effectively resolving the permission issue. This modification is essential for operations requiring write access to protected directories.