Commit26e65eb

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Clarify nbtree posting list update desc issue.

Per complaint from Melanie Plageman.Follow-up to commit5d6728e.Reported-By: Melanie Plageman <melanieplageman@gmail.com>Discussion:https://postgr.es/m/20230411002315.oyaicmcqrq2hb3ek@liskov

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Original file line number	Diff line number	Diff line change
`@@ -223,6 +223,11 @@ delvacuum_desc(StringInfo buf, char *block_data,`
`223`	`223`	`Assert(OffsetNumberIsValid(off));`
`224`	`224`	`Assert(updates->ndeletedtids>0);`
`225`	`225`
	`226`	`+/*`
	`227`	`+ * "ptid" is the symbol name used when building each xl_btree_update's`
	`228`	`+ * array of offsets into a posting list tuple's ItemPointerData array.`
	`229`	`+ * xl_btree_update describes a subset of the existing TIDs to delete.`
	`230`	`+ */`
`226`	`231`	`appendStringInfo(buf,"{ off: %u, nptids: %u, ptids: [",`
`227`	`232`	`off,updates->ndeletedtids);`
`228`	`233`	`for (intp=0;p<updates->ndeletedtids;p++)`

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