[COMMITTERS] pgsql: Fix typo in comment.

[Tom Lane]

Log Message:
-----------
Fix typo in comment.

Modified Files:
--------------
    pgsql/src/backend/utils/sort:
        tuplesort.c (r1.49 -> r1.50)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/sort/tuplesort.c.diff?r1=1.49&r2=1.50)

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