If you would like to assist with this document, there are two primary avenues that are extremely helpful.
Purchase an OpenBook! If you purchase OpenDocs books, OpenDocs Publishing will donate a portion of the proceeds back to the Open Source Documentation Fund. This fund assists authors financially while they continue to write documentation for Open Source projects.
Provide a monetary contribution to the document. By contributing, you can even request what you would like to have updated, written, or expanded within the document. To provide a monetary contribution, please contact Command Prompt, Inc. You may also contact Joshua Drake.
If you have written something that you would like to contribute, please email it to firstname.lastname@example.org