Merge branch 'master' of https://github.com/nexusformat/definitions i…

…nto osborn-suggestions

base_classes/NXdata.nxdl.xml

@@ -69,8 +69,8 @@
 			or as a link to a field in another group).
 
 			It is recommended (as of NIAC2014) to use this attribute
-			rather than adding a signal attribute to the field.
-			See http://wiki.nexusformat.org/2014_How_to_find_default_data
+			rather than adding a signal attribute to the dataset.
+			See https://www.nexusformat.org/2014_How_to_find_default_data.html
 			for a summary of the discussion.
 		</doc>
 	</attribute>