[COMMITTERS] pgsql-server: Add steps for creating release notes.

[Bruce Momjian]

Log Message:
-----------
Add steps for creating release notes.

Modified Files:
--------------
    pgsql-server/src/tools:
        RELEASE_CHANGES (r1.42 -> r1.43)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/tools/RELEASE_CHANGES.diff?r1=1.42&r2=1.43)

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