Fix demo code (#1304)

Author: kblok

README.md

@@ -97,7 +97,7 @@ using(var page = await browser.NewPageAsync())
 ```cs
 using (var page = await browser.NewPageAsync())
 {
-    var seven = await page.EvaluateFunctionAsync<int>("4 + 3");
+    var seven = await page.EvaluateExpressionAsync<int>("4 + 3");
     var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);
     Console.WriteLine(someObject.a);
 }

docfx_project/api/index.md

@@ -59,7 +59,7 @@ using(var page = await Browser.NewPageAsync())
 ```cs
 using (var page = await Browser.NewPageAsync())
 {
-    var seven = await page.EvaluateFunctionAsync<int>("4 + 3");
+    var seven = await page.EvaluateExpressionAsync<int>("4 + 3");
     var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);
     Console.WriteLine(someObject.a);
 }

docfx_project/examples/index.md

@@ -57,7 +57,7 @@ using(var page = await browser.NewPageAsync())
 ```cs
 using (var page = await browser.NewPageAsync())
 {
-    var seven = await page.EvaluateFunctionAsync<int>("()=> 4 + 3");
+    var seven = await page.EvaluateExpressionAsync<int>("()=> 4 + 3");
     var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);
     Console.WriteLine(someObject.a);
 }