Fix typo in RemotingServer App.Config 

Config file had sppendToFile element name instead of appendToFile.
diff --git a/examples/net/2.0/Remoting/RemotingServer/cs/src/App.config b/examples/net/2.0/Remoting/RemotingServer/cs/src/App.config
index 52b699d..9a8b391 100644
--- a/examples/net/2.0/Remoting/RemotingServer/cs/src/App.config
+++ b/examples/net/2.0/Remoting/RemotingServer/cs/src/App.config
@@ -34,7 +34,7 @@
 		</appender>
 		<appender name="LogFileAppender" type="log4net.Appender.FileAppender">
 			<file value="log-file.txt" />
-			<sppendToFile value="true" />
+			<appendToFile value="true" />
 			<layout type="log4net.Layout.PatternLayout">
 				<header value="FILE HEADER&#13;&#10;" />
 				<footer value="FILE FOOTER&#13;&#10;" />