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Remove outdated comment on how to set logtape's read buffer size.

Commitb75f467 removed the LogicalTapeAssignReadBufferSize() function,but forgot to update this comment. The read buffer size is an argument toLogicalTapeRewindForRead() now. Doesn't seem worth going into the detailsin the file header comment, so remove the outdated sentence altogether.

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src/backend/utils/sort
- logtape.c

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`‎src/backend/utils/sort/logtape.c`

Lines changed: 1 addition & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -47,8 +47,7 @@`
`47`	`47`	`*`
`48`	`48`	`* To further make the I/Os more sequential, we can use a larger buffer`
`49`	`49`	`* when reading, and read multiple blocks from the same tape in one go,`
`50`		`- * whenever the buffer becomes empty. LogicalTapeAssignReadBufferSize()`
`51`		`- * can be used to set the size of the read buffer.`
	`50`	`+ * whenever the buffer becomes empty.`
`52`	`51`	`*`
`53`	`52`	`* To support the above policy of writing to the lowest free block,`
`54`	`53`	`* ltsGetFreeBlock sorts the list of free block numbers into decreasing`

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Commit45f87b7

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`‎src/backend/utils/sort/logtape.c`

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