Replace GetValue<string> with ToString() to correctly parse other primitive types

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/ParseNodes/ValueNode.cs

@@ -22,7 +22,7 @@ public ValueNode(ParsingContext context, JsonNode node) : base(
 
         public override string GetScalarValue()
         {
-            return _node.GetValue<string>();
+            return _node.GetScalarValue();
         }
 
         /// <summary>

src/Microsoft.OpenApi.Readers/ParsingContext.cs

@@ -83,7 +83,7 @@ internal OpenApiDocument Parse(JsonNode jsonNode)
         /// <summary>
         /// Initiates the parsing process of a fragment.  Not thread safe and should only be called once on a parsing context
         /// </summary>
-        /// <param name="jsonDocument"></param>
+        /// <param name="jsonNode"></param>
         /// <param name="version">OpenAPI version of the fragment</param>
         /// <returns>An OpenApiDocument populated based on the passed yamlDocument </returns>
         internal T ParseFragment<T>(JsonNode jsonNode, OpenApiSpecVersion version) where T : IOpenApiElement

src/Microsoft.OpenApi.Readers/YamlHelper.cs

@@ -17,9 +17,9 @@ public static string GetScalarValue(this JsonNode node)
             if (node == null)
             {
                 //throw new OpenApiException($"Expected scalar at line {node.Start.Line}");
-            }
+            } 
 
-            return scalarNode?.GetValue<string>();
+            return scalarNode?.GetScalarValue();
         }
 
         public static JsonNode ParseJsonString(string yamlString)