Typo in comment in nbtree.h

Hi

Following along with a btree bug report, I saw a typo "referencd" in a
comment. Also "we've" seems a bit odd here, but maybe it's just me.
Maybe it should be like this?

--- a/src/include/access/nbtree.h
+++ b/src/include/access/nbtree.h
@@ -522,7 +522,7 @@ typedef struct BTScanPosData
        Buffer          buf;                    /* if valid, the
buffer is pinned */

        XLogRecPtr      lsn;                    /* pos in the WAL
stream when page was read */
-       BlockNumber currPage;           /* page we've referencd by
items array */
+       BlockNumber currPage;           /* page referenced by items array */
        BlockNumber nextPage;           /* page's right link when we
scanned it */

/*

--
Thomas Munro
http://www.enterprisedb.com

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