Commitbe5676f

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Remove misleading comment from pathnodes.h.

As of commite5253fd, it is no longer true that the leader alwaysexecutes the subplan of a Gather Merge node. Remove comment to thateffect.Back-patch to 11.Discussion:https://postgr.es/m/CA%2BhUKGJEaZJYezXAOutuiWT%2BfxCA44%2BoKtVPAND2ubLiigR%3D-w%40mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -1416,8 +1416,7 @@ typedef struct GatherPath`
`1416`	`1416`
`1417`	`1417`	`/*`
`1418`	`1418`	`* GatherMergePath runs several copies of a plan in parallel and collects`
`1419`		`- * the results, preserving their common sort order. For gather merge, the`
`1420`		`- * parallel leader always executes the plan too, so we don't need single_copy.`
	`1419`	`+ * the results, preserving their common sort order.`
`1421`	`1420`	`*/`
`1422`	`1421`	`typedefstructGatherMergePath`
`1423`	`1422`	`{`

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