This phrase (or a very close form) is of French origin at the beginning of the 18th century, by the Baron de Montesquieu.
The exact sentence in French, which is a quote is “Le mieux est le mortel ennemi du bien”.
Others attribute it either to Voltaire (1772) or to others.
Jacques
There is a tooling thread here Choice of documentation platform and translation integration · Issue #1 · RawTherapee/RawPedia · GitHub
The Github discussion is extremely important, so thanks for the pointer. I was thinking, however, more about the classical aspects of writing documentation, e.g. how many topics per page, whether to separate out how-to examples and tutorials from descriptive material, how to standardize headings and subheadings if that is wanted. Basically, what can we do to make RawPedia easy to read, easy to find things, and to serve as a first resource for new users while still giving the detail experienced users need.
Oh, is that what you meant when you wrote “who reviews and who makes final decisions” and “how others… can participate”?
There are guidelines here: Contributing - RawPedia
When in doubt, look at how the other parts of the documentation are written.