Merge pull request #3509 from AutoMapper/lbargaoanu-patch-1

Update 10.0-Upgrade-Guide.md

docs/10.0-Upgrade-Guide.md

@@ -12,7 +12,7 @@ You can always rename things or use an explicit `MapFrom`.
 
 ## `Context.Mapper.Map` overloads that receive a context were removed
 
-Not needed because the context is passed by default.
+Not needed, because the context is passed by default, so you can change the context instance you already have.
 
 ## `UseDestinationValue` is now inherited by default