Improve PROTOCOL.md
Improve PROTOCOL.md

The previous descriptions of `|switch|` and `|-detailschange|` were wrong .

I also added some examples for `|-sidestart|` and `|-fieldstart|`.
CreaturePhil/Showdown-Boilerplate,DesoGit/Tsunami_PS,Elveman/RPCShowdownServer,Guernouille/Pokemon-Showdown,panpawn/Pokemon-Showdown,danpantry/Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,zek7rom/SpacialGaze,QuiteQuiet/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,Mystifi/Exiled,PS-Spectral/Spectral,jumbowhales/Pokemon-Showdown,HoeenCoder/SpacialGaze,jumbowhales/Pokemon-Showdown,xfix/Pokemon-Showdown,Sora-League/Sora,AnaRitaTorres/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,urkerab/Pokemon-Showdown,Zarel/Pokemon-Showdown,Git-Worm/City-PS,PS-Spectral/Spectral,zek7rom/SpacialGaze,ZestOfLife/FestiveLife,sirDonovan/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown,svivian/Pokemon-Showdown,Lord-Haji/SpacialGaze,Guernouille/Pokemon-Showdown,Lord-Haji/SpacialGaze,DesoGit/TsunamiPS,AustinXII/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,AustinXII/Pokemon-Showdown,jd4564/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,xCrystal/Pokemon-Showdown,Kokonoe-san/Glacia-PS,Bryan-0/Pokemon-Showdown,panpawn/Gold-Server,svivian/Pokemon-Showdown,ShowdownHelper/Saffron,HoeenCoder/SpacialGaze,Pikachuun/Pokemon-Showdown,urkerab/Pokemon-Showdown,Enigami/Pokemon-Showdown,ZestOfLife/FestiveLife,AWailOfATail/Pokemon-Showdown,cadaeic/Pokemon-Showdown,Enigami/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,svivian/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,urkerab/Pokemon-Showdown,azum4roll/Pokemon-Showdown,Alpha-Devs/Alpha-Server,KewlStatics/Shit,danpantry/Pokemon-Showdown,panpawn/Gold-Server,aakashrajput/Pokemon-Showdown,xfix/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,AnaRitaTorres/Pokemon-Showdown,svivian/Pokemon-Showdown,Enigami/Pokemon-Showdown,Sora-League/Sora,Enigami/Pokemon-Showdown,DesoGit/Tsunami_PS,Mystifi/Exiled,Sora-League/Sora,Lord-Haji/SpacialGaze,ZestOfLife/PSserver,jumbowhales/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,xfix/Pokemon-Showdown,HoeenCoder/SpacialGaze,svivian/Pokemon-Showdown,ZestOfLife/PSserver,AWailOfATail/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,ShowdownHelper/Saffron,sirDonovan/Pokemon-Showdown,DesoGit/TsunamiPS,Zarel/Pokemon-Showdown,Kokonoe-san/Glacia-PS,ShowdownHelper/Saffron,Alpha-Devs/OmegaRuby-Server,TbirdClanWish/Pokemon-Showdown,Elveman/RPCShowdownServer,Flareninja/Showdown-Boilerplate,EienSeiryuu/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,DesoGit/Tsunami_PS,DarkSuicune/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,cadaeic/Pokemon-Showdown,azum4roll/Pokemon-Showdown,KewlStatics/Shit,HoeenCoder/SpacialGaze,Flareninja/Showdown-Boilerplate,Volcos/SpacialGaze,aakashrajput/Pokemon-Showdown,jd4564/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Volcos/SpacialGaze,KewlStatics/Alliance,Pikachuun/Pokemon-Showdown,Zarel/Pokemon-Showdown,Alpha-Devs/Alpha-Server,panpawn/Pokemon-Showdown,xCrystal/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,KewlStatics/Alliance,Git-Worm/City-PS,Mystifi/Exiled,xCrystal/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,panpawn/Gold-Server,PS-Spectral/Spectral,CreaturePhil/Showdown-Boilerplate