Log Message:
-----------
Clarify documentation of age() functions.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.224 -> r1.225)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.224&r2=1.225)

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