1️⃣ Value contributions to documentation just as much as code contributions
2️⃣ Put documentation and code in the same project repo
3️⃣ Make documentation a requirement for a merge or release milestone
4️⃣ Have a consistent contribution process for code and documentation
5️⃣ Have well-documented processes for contributing to documentation

That’s the TL;DR, but each of these is expanded upon in the article.