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Fix typo in add_paths_to_append_rel()

The comment should have been referring to the number of workers, not thenumber of paths.Author: Ashutosh BapatDiscussion:https://postgr.es/m/CAFjFpRcbp4702jcp387PExt3fNCt62QJN8++DQGwBhsW6wRHWA@mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -1574,7 +1574,7 @@ add_paths_to_append_rel(PlannerInfo root, RelOptInfo rel,`
`1574`	`1574`
`1575`	`1575`	`/*`
`1576`	`1576`	`* If the use of parallel append is permitted, always request at least`
`1577`		`- * log2(# of children)paths. We assume it can be useful to have`
	`1577`	`+ * log2(# of children)workers. We assume it can be useful to have`
`1578`	`1578`	`* extra workers in this case because they will be spread out across`
`1579`	`1579`	`* the children. The precise formula is just a guess, but we don't`
`1580`	`1580`	`* want to end up with a radically different answer for a table with N`

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