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Fix ReorderBufferCheckMemoryLimit() comment.

Commit7259736 updated the comment but it was not correct sinceReorderBufferLargestStreamableTopTXN() returns only top-leveltransactions.Reviewed-by: Amit KapilaDiscussion:https://postgr.es/m/CAD21AoA9XB7OR86BqvrCe2dMYX%2BZv3-BvVmjF%3DGY2z6jN-kqjg%40mail.gmail.comBackpatch-through: 14

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Original file line number	Diff line number	Diff line change
`@@ -3602,8 +3602,8 @@ ReorderBufferCheckMemoryLimit(ReorderBuffer *rb)`
`3602`	`3602`	`rb->size>0))`
`3603`	`3603`	`{`
`3604`	`3604`	`/*`
`3605`		`- * Pick the largest transaction(or subtransaction)and evict it from`
`3606`		`- *memory by streaming,if possible. Otherwise, spill to disk.`
	`3605`	`+ * Pick the largest transaction and evict it from memory by streaming,`
	`3606`	`+ * if possible. Otherwise, spill to disk.`
`3607`	`3607`	`*/`
`3608`	`3608`	`if (ReorderBufferCanStartStreaming(rb)&&`
`3609`	`3609`	`(txn=ReorderBufferLargestStreamableTopTXN(rb))!=NULL)`

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