Update import, code cleanup

Author: MaggieKimani1

src/Microsoft.OpenApi/Models/OpenApiSchema.cs

@@ -576,7 +576,7 @@ public void SerializeAsV2(IOpenApiWriter writer)
         internal void WriteV31Properties(IOpenApiWriter writer)
         {
             writer.WriteProperty(OpenApiConstants.DollarSchema, Schema);
-            writer.WriteOptionalCollection(OpenApiConstants.TypeArray, TypeArray, (w, s) => w.WriteRaw(s));
+            writer.WriteOptionalCollection(OpenApiConstants.Type, TypeArray, (w, s) => w.WriteRaw(s));
             writer.WriteProperty(OpenApiConstants.Id, Id);
             writer.WriteProperty(OpenApiConstants.Comment, Comment);
             writer.WriteProperty(OpenApiConstants.Vocabulary, Vocabulary);

test/Microsoft.OpenApi.Readers.Tests/ParseNodes/ParserHelperTests.cs

@@ -2,7 +2,7 @@
 // Licensed under the MIT license.
 
 using System.Globalization;
-using Microsoft.OpenApi.Readers.ParseNodes;
+using Microsoft.OpenApi.Reader.ParseNodes;
 using Xunit;
 
 namespace Microsoft.OpenApi.Readers.Tests.ParseNodes