Documentation: Fixes ReadManyItemsStreamAsync example (#3034)

Updated ReadManyItemsStreamAsync example code snippet with proper working code.

Microsoft.Azure.Cosmos/src/Resource/Container/Container.cs

@@ -639,16 +639,20 @@ public abstract Task<ItemResponse<T>> ReplaceItemAsync<T>(
  /// ("Id3", new PartitionKey("pkValue3"))
  /// };
  /// 
- /// using (ResponseMessage responseMessage = await this.Container.ReadManyItemsStreamAsync(itemList))
+ /// using (ResponseMessage response = await this.Container.ReadManyItemsStreamAsync(itemList))
  /// {
- /// using (Stream stream = response.ReadBodyAsync())
+ /// if (!response.IsSuccessStatusCode)
  /// {
- /// //Read or do other operations with the stream
- /// using (StreamReader streamReader = new StreamReader(stream))
- /// {
- /// string content = streamReader.ReadToEndAsync();
- /// }
+ /// //Handle and log exception
+ /// return;
  /// }
+ ///
+ /// //Read or do other operations with the stream
+ /// using (StreamReader streamReader = new StreamReader(response.Content))
+ /// {
+ /// string content = streamReader.ReadToEndAsync();
+ /// }
+ /// 
  /// }
  /// ]]>
  /// </code>