Commit01357f1

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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
`@@ -3507,8 +3507,8 @@ ReorderBufferCheckMemoryLimit(ReorderBuffer *rb)`
`3507`	`3507`	`while (rb->size >=logical_decoding_work_mem*1024L)`
`3508`	`3508`	`{`
`3509`	`3509`	`/*`
`3510`		`- * Pick the largest transaction(or subtransaction)and evict it from`
`3511`		`- *memory by streaming,if possible. Otherwise, spill to disk.`
	`3510`	`+ * Pick the largest transaction and evict it from memory by streaming,`
	`3511`	`+ * if possible. Otherwise, spill to disk.`
`3512`	`3512`	`*/`
`3513`	`3513`	`if (ReorderBufferCanStartStreaming(rb)&&`
`3514`	`3514`	`(txn=ReorderBufferLargestTopTXN(rb))!=NULL)`

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