cpu/esp_common: add/fix comments and messages
cpu/esp_common: add/fix comments and messages


yogo1212/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,x3ro/RIOT,josephnoir/RIOT,miri64/RIOT,RIOT-OS/RIOT,aeneby/RIOT,miri64/RIOT,aeneby/RIOT,authmillenon/RIOT,ant9000/RIOT,kaspar030/RIOT,basilfx/RIOT,authmillenon/RIOT,kYc0o/RIOT,cladmi/RIOT,yogo1212/RIOT,OTAkeys/RIOT,aeneby/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,yogo1212/RIOT,yogo1212/RIOT,OTAkeys/RIOT,kaspar030/RIOT,toonst/RIOT,toonst/RIOT,kYc0o/RIOT,authmillenon/RIOT,authmillenon/RIOT,kaspar030/RIOT,mtausig/RIOT,ant9000/RIOT,cladmi/RIOT,x3ro/RIOT,mtausig/RIOT,josephnoir/RIOT,ant9000/RIOT,OTAkeys/RIOT,yogo1212/RIOT,x3ro/RIOT,basilfx/RIOT,aeneby/RIOT,yogo1212/RIOT,smlng/RIOT,rfuentess/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,ant9000/RIOT,rfuentess/RIOT,josephnoir/RIOT,OlegHahm/RIOT,kYc0o/RIOT,OlegHahm/RIOT,authmillenon/RIOT,ant9000/RIOT,mtausig/RIOT,kaspar030/RIOT,cladmi/RIOT,smlng/RIOT,josephnoir/RIOT,josephnoir/RIOT,cladmi/RIOT,x3ro/RIOT,cladmi/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,mtausig/RIOT,x3ro/RIOT,kYc0o/RIOT,OlegHahm/RIOT,rfuentess/RIOT,smlng/RIOT,toonst/RIOT,miri64/RIOT,basilfx/RIOT,smlng/RIOT,basilfx/RIOT,rfuentess/RIOT,jasonatran/RIOT,smlng/RIOT,jasonatran/RIOT,rfuentess/RIOT,kaspar030/RIOT,toonst/RIOT,toonst/RIOT,OlegHahm/RIOT,jasonatran/RIOT,miri64/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,mtausig/RIOT,aeneby/RIOT,basilfx/RIOT