aggregator2: clarify documentation about signing the aggregate.
aggregator2: clarify documentation about signing the aggregate.

simplesamlphp/simplesamlphp,Kunstmaan/simplesamlphp,maytechnet/simplesamlphp,grnet/simplesamlphp,madmatt/simplesamlphp,dnmvisser/simplesamlphp,girgen/simplesamlphp,ghalse/simplesamlphp,madmatt/simplesamlphp,cwaldbieser/simplesamlphp,girgen/simplesamlphp,dzuelke/simplesamlphp,dzuelke/simplesamlphp,shoaibali/simplesamlphp,maytechnet/simplesamlphp,BrettMerrick/simplesamlphp,dialogik/simplesamlphp,BrettMerrick/simplesamlphp,ghalse/simplesamlphp,maytechnet/simplesamlphp,dzuelke/simplesamlphp,madmatt/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,dnmvisser/simplesamlphp,jschlyter/simplesamlphp,maytechnet/simplesamlphp,Kunstmaan/simplesamlphp,jschlyter/simplesamlphp,dialogik/simplesamlphp,dialogik/simplesamlphp,shoaibali/simplesamlphp,Kunstmaan/simplesamlphp,girgen/simplesamlphp,sitya/simplesamlphp,simplesamlphp/simplesamlphp,jschlyter/simplesamlphp,sitya/simplesamlphp,gtkrug/simplesamlphp,grnet/simplesamlphp,dzuelke/simplesamlphp,dialogik/simplesamlphp,cwaldbieser/simplesamlphp,BrettMerrick/simplesamlphp,dnmvisser/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,gtkrug/simplesamlphp,girgen/simplesamlphp,shoaibali/simplesamlphp,BrettMerrick/simplesamlphp,jschlyter/simplesamlphp,grnet/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,dnmvisser/simplesamlphp,gtkrug/simplesamlphp,ghalse/simplesamlphp,shoaibali/simplesamlphp,simplesamlphp/simplesamlphp,gtkrug/simplesamlphp,cwaldbieser/simplesamlphp,girgen/simplesamlphp,sitya/simplesamlphp,simplesamlphp/simplesamlphp,dialogik/simplesamlphp,sitya/simplesamlphp,StudentLifeMarketingAndDesign/simplesamlphp,madmatt/simplesamlphp,Kunstmaan/simplesamlphp,jschlyter/simplesamlphp,ghalse/simplesamlphp,grnet/simplesamlphp,cwaldbieser/simplesamlphp