Add a comment to distinguish backend types

The data checksums entries were seemingly auxiliary processes from
reading the code, but they are in fact background workers.  Add a
comment to clarify.  Backpatch down to v19 where online checksums
were introduced.

Author: Daniel Gustafsson <[email protected]>
Reported-by: Fujii Masao <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/cahgqgwfsbjqs2fv7b72hxzgv_fjmh6lag4e83pnfdou1jvg...@mail.gmail.com
Backpatch-through: 19

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/7a0299a1348b563c72a57a2a40462e90af9dfbac

Modified Files
--------------
src/include/miscadmin.h | 4 ++++
1 file changed, 4 insertions(+)

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