apply review suggestions

Author: JPVenson

src/Anthropic.Vertex/AnthropicVertexClientWithRawResponse.cs

@@ -91,21 +91,21 @@ private static void ValidateRequest(HttpRequestMessage requestMessage, out bool
         if (requestMessage.RequestUri is null)
         {
             throw new AnthropicInvalidDataException(
-                "Request is missing required path segments. Expected > 1 segments found none."
+                "Request is missing required path segments. Expected > 1 segments, found none."
             );
         }
 
         if (requestMessage.RequestUri.Segments.Length < 1)
         {
             throw new AnthropicInvalidDataException(
-                "Request is missing required path segments. Expected > 1 segments found none."
+                "Request is missing required path segments. Expected > 1 segments, found none."
             );
         }
 
         if (requestMessage.RequestUri.Segments[1].Trim('/') != "v1")
         {
             throw new AnthropicInvalidDataException(
-                $"Request is missing required path segments. Expected [0] segment to be 'v1' found {requestMessage.RequestUri.Segments[0]}."
+                $"Request is missing required path segments. Expected [0] segment to be 'v1', found {requestMessage.RequestUri.Segments[0]}."
             );
         }
 
@@ -119,17 +119,10 @@ private static void ValidateRequest(HttpRequestMessage requestMessage, out bool
                 $"The requested endpoint '{requestMessage.RequestUri.Segments.Last().Trim('/')}' is not yet supported."
             );
         }
-        if (
+
+        isCountEndpoint =
             requestMessage.RequestUri.Segments.Length >= 4
             && requestMessage.RequestUri.Segments[2].Trim('/') is "messages"
-            && requestMessage.RequestUri.Segments[3].Trim('/') is "count_tokens"
-        )
-        {
-            isCountEndpoint = true;
-        }
-        else
-        {
-            isCountEndpoint = false;
-        }
+            && requestMessage.RequestUri.Segments[3].Trim('/') is "count_tokens";
     }
 }