Remove obsolete _bt_compare() comment.
btbuild() has nothing to say about how NULL values compare in nbtree. Besides, there are _bt_compare() header comments that describe how NULL values are handled.
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@ -601,7 +601,6 @@ _bt_compare(Relation rel,
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datum = index_getattr(itup, scankey->sk_attno, itupdesc, &isNull);
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/* see comments about NULLs handling in btbuild */
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if (scankey->sk_flags & SK_ISNULL) /* key is NULL */
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{
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if (isNull)
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