The library was written to be very flexible and give the flexibility to write the LCD in different ways to the SR. The default configuration of the library is that in the header file, while the schematic and the example in the wiki is just an example (that should work) as to how to configure and use it.
If you are not too concerned about how the SR and LCD is connected, you can use the wiring in the header file and use the short constructor (default) to initialise your LCD, i.e. use the text schematic.