Fix typo in the code and documentation

Change-Id: I4fa01e4790ba3a50d8a59a5a85e6781bd8f539d1
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/utils.robot b/lib/utils.robot
index 63464a3..61497fc 100755
--- a/lib/utils.robot
+++ b/lib/utils.robot
@@ -69,7 +69,7 @@
     # max_timeout   Maximum time to wait.
     #               This should be expressed in Robot Framework's time format
     #               (e.g. "10 minutes").
-    # interfal      Interval to wait between status checks.
+    # interval      Interval to wait between status checks.
     #               This should be expressed in Robot Framework's time format
     #               (e.g. "5 seconds").