[doc][headers] Formatting tweaks and proper line wrapping
[doc][headers] Formatting tweaks and proper line wrapping

fvosberg/swiftmailer,voku/swiftmailer,zghosts/swiftmailer,kuslahne/swiftmailer,kuslahne/swiftmailer,UofSC/php-shared-functions,handautsav/swiftmailer,tweakers-dev/swiftmailer,deguif/swiftmailer,michabbb-backup/swiftmailer,Chhunlong/swiftmailer,peterkokot/swiftmailer,swiftmailer/swiftmailer,denpamusic/swiftmailer,handautsav/swiftmailer,robertklein/swiftmailer,swiftmailer/swiftmailer,jamesggordon/swiftmailer,Pardot/swiftmailer,robertklein/swiftmailer,michabbb-backup/swiftmailer,c960657/swiftmailer,Pardot/swiftmailer,papagel/swiftmailer,Rotzbua/swiftmailer,denpamusic/swiftmailer,Pardot/swiftmailer,Dubz/swiftmailer,UofSC/php-shared-functions,voku/swiftmailer,c960657/swiftmailer,gencer/swiftmailer,deguif/swiftmailer,jamesggordon/swiftmailer,gencer/swiftmailer,gburyakovsky/swiftmailer,papagel/swiftmailer,tweakers-dev/swiftmailer,UofSC/php-shared-functions,Pardot/swiftmailer,gburyakovsky/swiftmailer,peterkokot/swiftmailer,Dubz/swiftmailer,Chhunlong/swiftmailer,zghosts/swiftmailer,peterkokot/swiftmailer,Rotzbua/swiftmailer,fvosberg/swiftmailer