Update maxretry naming

Author: aavasthy

Microsoft.Azure.Cosmos/src/ClientRetryPolicy.cs

@@ -23,6 +23,7 @@ internal sealed class ClientRetryPolicy : IDocumentClientRetryPolicy
         private const int RetryIntervalInMS = 1000; // Once we detect failover wait for 1 second before retrying request.
         private const int MaxRetryCount = 120;
         private const int MaxServiceUnavailableRetryCount = 1;
+        private const int MaxSessionTokenRetryCount = 2;
 
         private readonly IDocumentClientRetryPolicy throttlingRetry;
         private readonly GlobalEndpointManager globalEndpointManager;
@@ -456,7 +457,7 @@ private ShouldRetryResult ShouldRetryOnSessionNotAvailable(DocumentServiceReques
                 }
                 else
                 {
-                    if (this.sessionTokenRetryCount > 2)
+                    if (this.sessionTokenRetryCount > MaxSessionTokenRetryCount)
                     {
                         // When cannot use multiple write locations, then don't retry the request if
                         // we have already tried this request on the write location.