It
is in the help file but in fairness you have to pretty much know what you're looking for before you can find it (type AutoFormat into the Help index, scroll to the bottom and click on 'results of formatting a document automatically'

.
I fall between two stools here (and I haven't been drinking - yet). On the one hand, having worked in IT support, I can see the view that many such queries should be solved by the RTFM principle. On the other hand I can understand that many modern software packages are very complex and what seems obvious and simple to one person is a mystery to another. The problem is that virtually no software remains 'easy and simple' for long. Anything that works well is bound to be modified and amended by requests - the *** thing
is useful for some (I use it) - and anything as long in the tooth as Word ends up with hundreds of features used to varying degree by different users.
I try to give advice to people based upon what they need. However I have frequently advised inexperienced home users (and I hasten to add here that I don't use that term in a derogatory fashion) that Wordpad (which comes free with Windows) is probably all they'll need only to find a couple of weeks later that some other 'expert' has told them they need Word. When they struggle with the features it somehow becomes the fault of the software for being too complex...
Jon