Not exactly... the docs state the acceptable input voltage on the pin V3v3. However, it doesn't state anything about the acceptable voltage on Vusb. It only describes how much voltage is available when powering peripherals by USB port. For the absolute voltage rating on Vusb, you have to check the datasheet of the regulator chip. Do your own research, but you should be able to go by the Electron docs. So, yes, go by the docs... do not put more voltage an V3v3 than recommended. When powering the boron by Vusb use up to 12V. I don't know why they didn't mark the Vusb pin as Vin since they are basically equivalent.
Boron Docs:
Electron Docs:
