pgsql: doc PG 17 relnotes: add dynamic shared memory registry item

doc PG 17 relnotes: add dynamic shared memory registry item

Reported-by: Nathan Bossart

Discussion: /messages/by-id/Ztcuwbs0FGCPOEu9@nathan

Backpatch-through: 17 only

Branch
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REL_17_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/26cea9fb8232d0ec8b4d637e2aa9558c9c6fb4da

Modified Files
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doc/src/sgml/release-17.sgml | 17 +++++++++++++++++
1 file changed, 17 insertions(+)