Fix FileContentResultAssertions messages.

Author: faddiv

src/FluentAssertions.AspNetCore.Mvc/FailureMessages.Designer.cs

@@ -130,10 +130,10 @@
     <value>Expected {0} to be of type '{1}' but was '{2}'</value>
   </data>
   <data name="FileContentResult_WithFileContents_LengthFail" xml:space="preserve">
-    <value>Expected "FileContentResult.FileContents" to have {0} byte(s), but found {1}.</value>
+    <value>Expected FileContentResult.FileContents to have {0} byte(s){reason} but found {1}.</value>
   </data>
   <data name="FileContentResult_WithFileContents_MatchFail" xml:space="preserve">
-    <value>Expected "FileContentResult.FileContents[{0}]" to be {1:x2}, but found {2:x2}.</value>
+    <value>Expected FileContentResult.FileContents[{0}] to be {1:x2}{reason} but found {2:x2}.</value>
   </data>
   <data name="RedirectToActionResult_RouteValues_ContainsKey" xml:space="preserve">
     <value>RedirectToActionResult.RouteValues does not contain key {0}.</value>

src/FluentAssertions.AspNetCore.Mvc/FailureMessages.resx

@@ -22,10 +22,10 @@ public void WithFileContents_GivenExpectedValue_ShouldPass()
         [Theory]
         [InlineData(
             "Test 1", "Test 11"
-            , "Expected \"FileContentResult.FileContents\" to have 7 byte(s), but found 6.")]
+            , "Expected FileContentResult.FileContents to have 7 byte(s) because it is 10 but found 6.")]
         [InlineData(
             "Test 1a", "Test 2a"
-            , "Expected \"FileContentResult.FileContents[5]\" to be 0x32, but found 0x31.")]
+            , "Expected FileContentResult.FileContents[5] to be 0x32 because it is 10 but found 0x31.")]
         public void WithFileContents_GivenUnexpectedValue_ShouldFail(
             string actual, string expected, string failureMessage)
         {
@@ -35,7 +35,7 @@ public void WithFileContents_GivenUnexpectedValue_ShouldFail(
 
             Action a = () => result.Should()
                 .BeFileContentResult()
-                .WithFileContents(expectedBytes);
+                .WithFileContents(expectedBytes, "it is {0}", 10);
 
             a.Should().Throw<Exception>()
                 .WithMessage(failureMessage);