MTL MXM: fix check-help-string.pl errors and warnings.

This commit was SVN r32533.

ompi/mca/mtl/mxm/help-mtl-mxm.txt

@@ -46,9 +46,6 @@ Initialization of MXM library failed.
 
   Error: %s
 
-[error polling network]
-Error %s occurred in attempting to make network progress (mxm_mq_ipeek).
-
 [error posting receive]
 Unable to post application receive buffer
 
@@ -56,12 +53,15 @@ Unable to post application receive buffer
   Buffer:     %p
   Length:     %d
 
+[error posting message receive]
+Unable to post application receive buffer
+
+  Error:      %s
+  Buffer:     %p
+  Length:     %d
+
 [error posting send]
 Unable to post application send buffer
 
   Error:      %s
 
-[error while waiting in send]
-Error while waiting in send
-
-  Error:      %s