Edit comment and add marker for version update.

Signed-off-by: Robin <rbarrand@amazon.com>

Gems/Atom/RPI/Code/Source/RPI.Builders/Model/MaterialAssetBuilderComponent.cpp

@@ -44,7 +44,7 @@ namespace AZ
             if (auto* serialize = azrtti_cast<SerializeContext*>(context))
             {
                 serialize->Class<MaterialAssetDependenciesComponent, Component>()
-                    ->Version(5)
+                    ->Version(5) // Set materialtype dependency to OrderOnce
                     ->Attribute(Edit::Attributes::SystemComponentTags, AZStd::vector<Crc32>({ AssetBuilderSDK::ComponentTags::AssetBuilder }));
             }
         }
@@ -88,8 +88,11 @@ namespace AZ
                 jobDependency.m_sourceFile = materialTypeSource;
                 jobDependency.m_platformIdentifier = platformIdentifier;
 
-                // If includeMaterialPropertyNames is true, then we need materials to depend on materialtype only once in order to get
-                // the property names. After the initial processing, materials will no longer be dependent on materialtype files.
+                // If includeMaterialPropertyNames is false, then a job dependency is needed so the material builder can validate
+                // MaterialAsset properties against the MaterialTypeAsset at asset build time. If includeMaterialPropertyNames is true, the
+                // material properties will be validated at runtime when the material is loaded, so the job dependency is needed only for
+                // first-time processing to set up the initial MaterialAsset. This speeds up AP processing time when a materialtype file is
+                // edited (e.g. 10s when editing StandardPBR.materialtype on AtomTest project from 45s).
                 bool includeMaterialPropertyNames = true;
                 RPI::MaterialConverterBus::BroadcastResult(includeMaterialPropertyNames, &RPI::MaterialConverterBus::Events::ShouldIncludeMaterialPropertyNames);
                 jobDependency.m_type = includeMaterialPropertyNames ? AssetBuilderSDK::JobDependencyType::OrderOnce : AssetBuilderSDK::JobDependencyType::Order;