As laid out in T287175, the Dev Portal is not going to be "a wiki that anyone can edit" and an item (see T276708) and its placement is going to be in some machine-readable format.

After someone followed T276702: Workflow how to propose content changes,

• a proposed code change (add an item as a file, edit a file) is created in a code review system (likely GitLab, as a Gerrit successor),
• the change is reviewed by Developer-Advocacy owners of the DevPortal (check if all data required by T276708 is included, etc)
• the change is merged
• translatable strings exported to twn, see T276700: Content localization infrastructure setup (export, import, deploy) for that
• changes get deployed, see T290257: Workflow how to deploy changes for that