There is no one correct way to write a PhD acknowledgement. You may want to include people who have supported you throughout your studies, such as your family, friends, or supervisors. You may also want to thank anyone who has helped you with your research, such as by providing data, funding, or equipment. You may also want to express your gratitude to your institution or any other organizations that have supported you. Whatever you choose to include, make sure to write in a sincere and personal tone.