Manually modify Code API pages?

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I thought that there would be cases where sharing internal design docs (UML diagrams etc.) is beneficial to the future developers (or even to users?). But wiki pages (ros.org/wiki/$TOOL_HOME$) might be better saved for how-to-use explanation rather than internal implementation description. Code API pages (ros.org/doc/groovy/api/$TOOL_HOME$/html) seem perfect place, but is there a way to manually update API pages (via web browser like wiki)? I've seen this thread that says API pages are autogenerated from code documents but haven't found anything that answers my question. Being able to modify the page layout helps particularlly when I want to paste images.