You're kidding, right? The End User License Agreement (EULA) you agreed to by installing and using the product specifically states that you are prohibited from altering the program in any way. They are certainly not going to provide any documentation on how to do it.
Thanks for the comment -- but you will find normal use of configuration files (INI, CFG and so on) is not "altering the program" as specified in the EULA. The Cleaning Lab INI file is unusual because it sets more than 600 different parameters. Most of the INI files in your C: drive probably set no more than a couple of dozen (like Cleaning Lab's /Options menu default settings.)
You may be right that most users do not know and do not care -- but this is why user groups persist, for those who want to find out more.
but you will find normal use of configuration files (INI, CFG and so on) is not "altering the program" as specified in the EULA.
I think your definition of "normal use" and "altering the program" may be open to interpretation. But my point (and the answer to your original question) was that there is no documentation available for altering these files.