Update mmgr's README to mention BumpContext

David Rowley <drowley@postgresql.org>

Commit: 58cf2e120e8aee2daed5a9b9ee4471574f712b3b
Author: David Rowley <drowley@postgresql.org>
Date: 2024-04-16T22:49:09Z
Releases: 17.0
Update mmgr's README to mention BumpContext

Oversight in 29f6a959c.

In passing, since we now have 4 memory context types to choose from,
provide a brief overview of the specialities of each memory context
type.

Reported-by: Amul Sul
Author: Amul Sul, David Rowley
Discussion: https://postgr.es/m/CAAJ_b94U2s9nHh--DEK=sPEZUQ+x7vQJ7529fF8UAH97QJ9NXg@mail.gmail.com

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src/backend/utils/mmgr/README modified +26 −19

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