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Remove lazy_scan_heap parallel VACUUM comment block.

This doesn't belong next to very high level discussion of the tasks thatlazy_scan_heap performs. There is already a similar, longer commentblock at the top of vacuumlazy.c that mentions lazy_scan_heap directly.

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src/backend/access/heap
- vacuumlazy.c

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`‎src/backend/access/heap/vacuumlazy.c`

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Original file line number	Diff line number	Diff line change
`@@ -886,18 +886,6 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,`
`886`	`886`	`*for dead-tuple TIDs, invoke lazy_vacuum to vacuum indexes and vacuum`
`887`	`887`	`*heap relation during its own second pass over the heap.`
`888`	`888`	`*`
`889`		`- *If the table has at least two indexes, we execute both index vacuum`
`890`		`- *and index cleanup with parallel workers unless parallel vacuum is`
`891`		`- *disabled. In a parallel vacuum, we enter parallel mode and then`
`892`		`- *create both the parallel context and the DSM segment before starting`
`893`		`- *heap scan so that we can record dead tuples to the DSM segment. All`
`894`		`- *parallel workers are launched at beginning of index vacuuming and`
`895`		`- *index cleanup and they exit once done with all indexes. At the end of`
`896`		`- *this function we exit from parallel mode. Index bulk-deletion results`
`897`		`- *are stored in the DSM segment and we update index statistics for all`
`898`		`- *the indexes after exiting from parallel mode since writes are not`
`899`		`- *allowed during parallel mode.`
`900`		`- *`
`901`	`889`	`*If there are no indexes then we can reclaim line pointers on the fly;`
`902`	`890`	`*dead line pointers need only be retained until all index pointers that`
`903`	`891`	`*reference them have been killed.`

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Commit97f5aef

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`‎src/backend/access/heap/vacuumlazy.c`

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