Common Transformations?

I am trying to figure out what SetTextMatrix is all about. In the documentation, I keep seeing ‘refer to section 4.2.2 ‘Common Transformations’ in PDF Reference Manual’.

Where is this? I have searched the site for PDF Reference Manual and Common Transformations but am unable to find it.

I found it!

The help text for anything that mentions this Manual should be updated to make it more clear that it is not a PDFTron Guide. Knowing this fact would have made it much easier to find and prevented a lot of frustration.