docs/library/usocket: Move socket.error to its own section.
docs/library/usocket: Move socket.error to its own section.

It's too minor a point to start the module description with it.

AriZuu/micropython,kerneltask/micropython,Timmenem/micropython,selste/micropython,adafruit/circuitpython,pramasoul/micropython,MrSurly/micropython-esp32,pozetroninc/micropython,infinnovation/micropython,blazewicz/micropython,oopy/micropython,henriknelson/micropython,bvernoux/micropython,pozetroninc/micropython,ryannathans/micropython,Timmenem/micropython,adafruit/circuitpython,pozetroninc/micropython,SHA2017-badge/micropython-esp32,torwag/micropython,lowRISC/micropython,trezor/micropython,torwag/micropython,MrSurly/micropython,micropython/micropython-esp32,Timmenem/micropython,lowRISC/micropython,trezor/micropython,blazewicz/micropython,AriZuu/micropython,AriZuu/micropython,SHA2017-badge/micropython-esp32,ryannathans/micropython,swegener/micropython,SHA2017-badge/micropython-esp32,henriknelson/micropython,kerneltask/micropython,adafruit/circuitpython,lowRISC/micropython,infinnovation/micropython,kerneltask/micropython,blazewicz/micropython,micropython/micropython-esp32,dmazzella/micropython,kerneltask/micropython,blazewicz/micropython,selste/micropython,pozetroninc/micropython,bvernoux/micropython,MrSurly/micropython,adafruit/micropython,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,blazewicz/micropython,henriknelson/micropython,bvernoux/micropython,lowRISC/micropython,MrSurly/micropython-esp32,Timmenem/micropython,Timmenem/micropython,tobbad/micropython,AriZuu/micropython,trezor/micropython,infinnovation/micropython,AriZuu/micropython,torwag/micropython,torwag/micropython,MrSurly/micropython,tralamazza/micropython,swegener/micropython,adafruit/micropython,oopy/micropython,dmazzella/micropython,ryannathans/micropython,adafruit/micropython,adafruit/circuitpython,tobbad/micropython,pfalcon/micropython,tobbad/micropython,pfalcon/micropython,pfalcon/micropython,swegener/micropython,trezor/micropython,oopy/micropython,micropython/micropython-esp32,swegener/micropython,infinnovation/micropython,tobbad/micropython,oopy/micropython,pfalcon/micropython,selste/micropython,tralamazza/micropython,adafruit/circuitpython,MrSurly/micropython,pozetroninc/micropython,henriknelson/micropython,bvernoux/micropython,MrSurly/micropython-esp32,infinnovation/micropython,oopy/micropython,ryannathans/micropython,micropython/micropython-esp32,pramasoul/micropython,henriknelson/micropython,kerneltask/micropython,dmazzella/micropython,swegener/micropython,tralamazza/micropython,adafruit/micropython,torwag/micropython,MrSurly/micropython-esp32,tobbad/micropython,pramasoul/micropython,adafruit/circuitpython,tralamazza/micropython,pramasoul/micropython,pfalcon/micropython,dmazzella/micropython,lowRISC/micropython,bvernoux/micropython,adafruit/micropython,micropython/micropython-esp32,SHA2017-badge/micropython-esp32,selste/micropython,trezor/micropython,ryannathans/micropython,pramasoul/micropython,selste/micropython,MrSurly/micropython