The aforementioned URL (Samba Official HOWTO) instructs the reader to read example config files how to determine how the options go together in practice. I suggest that to the same place would be added information where the reader can learn how the options go together in theory. Examples cannot cover all possibilities.
I have taken note of your comment. Would you please suggest specific text for inclusion on the HOWTO documentation. This is a very broad bug report.
updating qa contact
At any time in the future, if suggested text is submitted it will be accepted for addition to the documentation. Closing this report now.