The document provides guidance on contributing to the Mozilla Developer Network (MDN) by making edits and additions. Some key points:
1. Contributing can be done for personal benefit, to help one's projects, or to benefit the wider development community by improving documentation.
2. Contributions can range from small fixes to larger additions like writing new articles, translations, or code samples.
3. The process involves creating an account, finding pages to edit or improve, and making changes - with reviewers able to revert anything problematic.
4. Contributors are encouraged to ask questions on mailing lists or IRC if unsure and to work with others in the community.