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nbtree: Remove obsolete _bt_pgaddtup() comments.

Remove comments that are a throw back to a time when nbtree cared aboutwrite-ordering dependencies. The comments are similar to those removedby commit9ee7414, among others.

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src/backend/access/nbtree
- nbtinsert.c

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`‎src/backend/access/nbtree/nbtinsert.c`

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Original file line number	Diff line number	Diff line change
`@@ -2531,11 +2531,6 @@ _bt_newroot(Relation rel, Buffer lbuf, Buffer rbuf)`
`2531`	`2531`	`/*`
`2532`	`2532`	`*_bt_pgaddtup() -- add a data item to a particular page during split.`
`2533`	`2533`	`*`
`2534`		`- *This routine adds the tuple to the page as requested. It does`
`2535`		`- *not affect pin/lock status, but you'd better have a write lock`
`2536`		`- *and pin on the target buffer! Don't forget to write and release`
`2537`		`- *the buffer afterwards, either.`
`2538`		`- *`
`2539`	`2534`	`*The difference between this routine and a bare PageAddItem call is`
`2540`	`2535`	`*that this code knows that the leftmost data item on an internal`
`2541`	`2536`	`*btree page has a key that must be treated as minus infinity.`

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Commitb27e1b3

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`‎src/backend/access/nbtree/nbtinsert.c`

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