Commit66c5bd3

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Remove obsolete nbtree "get root" comment.

Remove a very old Berkeley era comment that doesn't seem to haveanything to do with the current locking considerations within_bt_getroot().Discussion:https://postgr.es/m/CAH2-WzmA2H+rL-xxF5o6QhMD+9x6cJTnz2Mr3Li_pbPBmqoTBQ@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -266,9 +266,7 @@ _bt_update_meta_cleanup_info(Relation rel, TransactionId oldestBtpoXact,`
`266`	`266`	`*`
`267`	`267`	`*Since the root page can move around the btree file, we have to read`
`268`	`268`	`*its location from the metadata page, and then read the root page`
`269`		`- *itself. If no root page exists yet, we have to create one. The`
`270`		`- *standard class of race conditions exists here; I think I covered`
`271`		`- *them all in the intricate dance of lock requests below.`
	`269`	`+ *itself. If no root page exists yet, we have to create one.`
`272`	`270`	`*`
`273`	`271`	`*The access type parameter (BT_READ or BT_WRITE) controls whether`
`274`	`272`	`*a new root page will be created or not. If access = BT_READ,`

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