Replace a couple of references to files that no longer exist in the source

tree with references to the appropriate URLs.

Robert Haas

src/DEVELOPERS

-Read the Developer's FAQ in pgsql/doc/FAQ_DEV.  All the developer tools
-are located in the pgsql/src/tools directory. 
-
+Read the development information in the wiki at
+<http://wiki.postgresql.org/wiki/Development_information>.  All the
+developer tools are located in the src/tools/ directory.

src/tools/RELEASE_CHANGES

@@ -31,8 +31,9 @@ For Major Releases
 	o src/interfaces/*/*/Makefile
 
 * Release notes
-	o check that dashed items from the TODO list are complete
-	o remove dashed TODO items
+	o check completion of items that have been marked as completed at
+	  http://wiki.postgresql.org/wiki/Todo
+	o remove completed TODO items
 	o group items into categories
 	o select major features
 	o select incompatibilities