Clarify that this is not SNS specific, re #10619

This definitely works with ISIS files, so the old text can be very confusing to users.
For now, keep it as "works with SNS and ISIS", as it was done for the LoadNexusMonitors doc,
as it is not clear if it works for others / is generally applicable.

Code/Mantid/Framework/DataHandling/inc/MantidDataHandling/LoadEventNexus.h

@@ -86,9 +86,10 @@ class DLLExport LoadEventNexus
 
   /// Summary of algorithms purpose
   virtual const std::string summary() const {
-    return "Loads Event NeXus files (produced by the SNS) and stores it in an "
-           "EventWorkspace. Optionally, you can filter out events falling "
-           "outside a range of times-of-flight and/or a time interval.";
+    return "Loads Event NeXus files (produced by the SNS or ISIS) and "
+      "stores it in an EventWorkspace. Optionally, you can filter out "
+      "events falling outside a range of times-of-flight and/or a time "
+      "interval.";
   }
 
   /// Version