Fix typos

Change-Id: Ic20df648fbc3546da20122deaa95f018b9d29f47
diff --git a/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java b/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java
index 0ff8906..b52b661 100644
--- a/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java
+++ b/src/main/java/org/onosproject/t3/impl/TroubleshootManager.java
@@ -568,7 +568,7 @@
                 computePath(completePath, trace, cp);
                 trace.setSuccess(false);
                 if (deviceService.getPort(cp) == null) {
-                    //Port is not existant on device.
+                    //Port is not existent on device.
                     log.warn("Port {} is not available on device.", cp);
                     trace.addResultMessage("Port " + cp + "is not available on device. Packet is dropped");
                 } else {