doc: Fix explanation related to pg_shmem_allocations

Offsets are shown as NULL only for anonymous allocations.

Author: Benoit Lobréau
Reviewed-by: Kyotaro Horiguchi
Discussion: 
https://postgr.es/m/cape8ez5lnoyqoz7azpvqm0e8sw+hw+k6g2nule+m4arfrra...@mail.gmail.com
Backpatch-through: 13

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/d28a14d2d4009cec91f9d0f0ceaa60f06c6e289c

Modified Files
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doc/src/sgml/catalogs.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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