update solidfluid example

examples/solidfluid/solidfluid.xml

@@ -75,15 +75,15 @@
   -->
   <method group="solid" transport="POSIX">options to POSIX transport</method>
  
-  <!--  the statement below would have the same effect as the one above plus
-         it assigns two transports to the group (so I/O is duplicated)  -->
-  <method name="solid" >
+  <!--  the statement below is equivalent to the one above plus -->
+  <method group="solid" >
       <transport="POSIX">options to POSIX transport</transport>
   </method>
+
   <method group="solid" <!-- engine="default-engine" --> >
       <transport="POSIX" fname="out_p.bp">options to POSIX transport</transport>
       <transport="MPI" fname="outsingle.bp">options to MPI transport</transport>
-      <!--  FIXME: how do we specify two output file names? -->
+      <!--  filenames overwrite the value provided in Open() call -->
   </method>
 
   <!--  Same as above but we can name the method separately from group name.
@@ -115,6 +115,9 @@
         Each write call needs to add an extra argument to identify the variable's group 
   -->
   <method name="groupless" transport="POSIX">options to transport</method>
+  <method name="groupless" >
+      <transport="POSIX">options to POSIX transport</transport>
+  </method>
 
   <!--  Global options for ADIOS that are not tied to a specific method -->
   <options>verbose=2</options>