Improved IMAP IDLE documentation a bit
Improved IMAP IDLE documentation a bit

jstedfast/MailKit,matt2003/MailKit,sstraus/MailKit,jamie-dainton/MailKit,dsbenghe/MailKit,FubarDevelopment/MailKit,eino-makitalo/MailKit,mganss/MailKit,nachocove/MailKit