Updates to follow style conventions

Author: Sebbs128

src/AngleSharp.Js/Extensions/EngineExtensions.cs

@@ -48,7 +48,7 @@ public static JsValue ToJsValue(this Object obj, EngineInstance engine)
                     switch (obj)
                     {
                         case DocumentReadyState _:
-                            string name = ((Enum)obj).GetOfficialName();
+                            var name = ((Enum)obj).GetOfficialName();
                             if (name != null)
                             {
                                 return new JsValue(name);

src/AngleSharp.Js/Extensions/ReflectionExtensions.cs

@@ -94,7 +94,7 @@ public static String GetOfficialName(this Enum value)
 
             // if the enum value does not have a DomNameAttribute, calling member.GetOfficialName() would return the value name
             // to allow previous behaviour to be preserved, if the DomNameAttribute is not present then null will be returned
-            IEnumerable<DomNameAttribute> names = member.GetCustomAttributes<DomNameAttribute>();
+            var names = member.GetCustomAttributes<DomNameAttribute>();
             var officialNameAttribute = names.FirstOrDefault();
             return officialNameAttribute?.OfficialName;
         }