Fix a typo in DefaultNetconfDevice class comment

Fix spelling of the word "Default" in the DefaultNetconfDevice class header
comment.

Change-Id: Ib0af0759f841e77c7c066bf4ee53052b29d1bc10
Signed-off-by: Ryan Goulding <ryandgoulding@gmail.com>
diff --git a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/DefaultNetconfDevice.java b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/DefaultNetconfDevice.java
index ba3cc75..a36f8d2 100644
--- a/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/DefaultNetconfDevice.java
+++ b/protocols/netconf/ctl/src/main/java/org/onosproject/netconf/ctl/DefaultNetconfDevice.java
@@ -27,7 +27,7 @@
 import java.io.IOException;
 
 /**
- * Defautl implementation of a NETCONF device.
+ * Default implementation of a NETCONF device.
  */
 public class DefaultNetconfDevice implements NetconfDevice {