Merge pull request #4390 from AutoMapper/lbargaoanu-patch-1

Reverted the nullable annotations

Author: jbogard

docs/source/13.0-Upgrade-Guide.md

@@ -6,10 +6,6 @@
 
 ## `AddAutoMapper` is part of the core package and the DI package is discontinued
 
-## `IMapper` has nullable annotations
-
-Besides the build-time impact, there is also a behaviour change. Non-generic `Map` overloads require now either a destination type or a non-null destination object.
-
 ## `AllowAdditiveTypeMapCreation` was removed
 
 Be sure to call `CreateMap` once for a source type, destination type pair. If you want to reuse configuration, use mapping inheritance.
@@ -24,4 +20,4 @@ The same pattern the framework uses to pass state to delegates. Note that `State
 
 ## Custom Equals/GetHashCode for source objects
 
-To avoid broken implementations, we no longer call those when checking for identical source objects, we hard code to checking object references.
+To avoid broken implementations, we no longer call those when checking for identical source objects, we hard code to checking object references.