rdblue commented on code in PR #16025:
URL: https://github.com/apache/iceberg/pull/16025#discussion_r4149987574


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format/spec.md:
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@@ -476,7 +482,7 @@ A data file with only new rows for the table may omit the 
`_last_updated_sequenc
 
 On read, if `_last_updated_sequence_number` is `null` it is assigned the 
`sequence_number` of the data file's manifest entry. The data sequence number 
of a data file is documented in [Sequence Number 
Inheritance](#sequence-number-inheritance).
 
-When `null`, a row's `_row_id` field is assigned to the `first_row_id` from 
its containing data file plus the row position in that data file (`_pos`). A 
data file's `first_row_id` field is assigned using inheritance and is 
documented in [First Row ID Inheritance](#first-row-id-inheritance). A 
manifest's `first_row_id` is assigned when writing the manifest list for a 
snapshot and is documented in [First Row ID 
Assignment](#first-row-id-assignment). A snapshot's `first-row-id` is set to 
the table's `next-row-id` and is documented in [Snapshot Row 
IDs](#snapshot-row-ids).
+When `null`, a row's `_row_id` field is assigned to the `first_row_id` from 
its containing data file plus the row position in that data file (`_pos`). A 
data file's `first_row_id` field is assigned using inheritance and is 
documented in [First Row ID Inheritance](#first-row-id-inheritance). A 
manifest's `first_row_id` is assigned when writing the snapshot root for a 
snapshot and is documented in [First Row ID 
Assignment](#first-row-id-assignment). In v4, a data file in the root manifest 
is assigned a `first_row_id` in the same way. A snapshot's `first-row-id` is 
set to the table's `next-row-id` and is documented in [Snapshot Row 
IDs](#snapshot-row-ids).

Review Comment:
   ```suggestion
   When `null`, a row's `_row_id` field is assigned to the `first_row_id` from 
its containing data file plus the row position in that data file (`_pos`). A 
data file's `first_row_id` field is assigned using inheritance and is 
documented in [First Row ID Inheritance](#first-row-id-inheritance). A 
manifest's `first_row_id` is assigned when writing the snapshot root file and 
is documented in [First Row ID Assignment](#first-row-id-assignment). In v4, a 
data file in the root manifest is assigned a `first_row_id` in the same way. A 
snapshot's `first-row-id` is set to the table's `next-row-id` and is documented 
in [Snapshot Row IDs](#snapshot-row-ids).
   ```
   
   This removes duplication while adding a minor clarification that reminds the 
reader that a "snapshot root" is a metadata file.



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