Log Message:
-----------
Replace a couple of references to files that no longer exist in the source
tree with references to the appropriate URLs.
Robert Haas
Modified Files:
--------------
pgsql/src:
DEVELOPERS (r1.5 -> r1.6)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/DEVELOPERS?r1=1.5&r2=1.6)
pgsql/src/tools:
RELEASE_CHANGES (r1.89 -> r1.90)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/tools/RELEASE_CHANGES?r1=1.89&r2=1.90)