Fix typo in the code and documentation

Change-Id: I4fa01e4790ba3a50d8a59a5a85e6781bd8f539d1
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/lib/connection_client.robot b/lib/connection_client.robot
index 6efb1b4..543879d 100755
--- a/lib/connection_client.robot
+++ b/lib/connection_client.robot
@@ -21,7 +21,7 @@
     #                   keyword. This includes, but is not limited to, the
     #                   following:
     #                   host, alias, port, timeout, newline, prompt, term_type,
-    #                   width, height, path_separator, endcoding
+    #                   width, height, path_separator, encoding
     #                   (For more information, please visit the SSHLibrary doc)
 
     #                   Of the above arguments to Open Connection, this keyword