Try to read it. You'll also find a diagram at page 23.
You can notice that the TRS input will interrupt the XLR signal when a TRS jack is inserted.
Although I don't see the same for the stereo inputs (maybe the diagram is wrong), I don't recommend using both XLR and TRS inputs of a channel in the same time for a couple of reasons - for one, you can't adjust individual characteristics of each input, and second - you may damage the microphones or induce undesired distortions.
If you need more inputs for microphones, consider using a mixer with more inputs.