doc: Clarify units for io_combine_limit and io_max_combine_limit.

If these parameters are set without units, the values are interpreted
as blocks. This detail was previously missing from the documentation,
so this commit adds it.

Backpatch to v17 where io_combine_limit was added.

Author: Karina Litskevich <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Reviewed-by: Xuneng Zhou <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/cacit8izcdkz1bnyqnqyvghxwjexsnjulrtyt894u4-ti7yh...@mail.gmail.com
Backpatch-through: 17

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/6fba6cb05ddfb177ac1c4efa508707e879fb8bd3

Modified Files
--------------
doc/src/sgml/config.sgml | 4 ++++
1 file changed, 4 insertions(+)

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