Clarifying docs around null behavior
Clarifying docs around null behavior

kisflying/AutoMapper,peterchase/AutoMapper,wilbit/AutoMapper,TylerCarlson1/AutoMapper,mwpowellhtx/AutoMapperContributed,dparra0007/AutoMapper,mjalil/AutoMapper,jasonholloway/AutoMapper,iaingalloway/AutoMapper,GeertVL/AutoMapper,AutoMapper/AutoMapper,grantadesign/AutoMapper,mwpowellhtx/AutoMapper,seanlin816/AutoMapper,jnm2/AutoMapper,AutoMapper/AutoMapper,ssalaberry/AutoMapper,grantadesign/AutoMapper,peterchase/AutoMapper,BlaiseD/AutoMapper,jbogard/AutoMapper,lbargaoanu/AutoMapper,sh-sabooni/AutoMapper,gentledepp/AutoMapper,briangweber/AutoMapper,EricSB/AutoMapper,mwpowellhtx/MicroMapper,michaelkauflin/AutoMapper,CandidoCleyton/AutoMapper