aio: Fix assertion, clarify README

The assertion wouldn't have triggered for a long while yet, but this won't
accidentally fail to detect the issue if/when it occurs.

Author: Matthias van de Meent <boekewurm+postg...@gmail.com>
Discussion: 
https://postgr.es/m/CAEze2Wj-43JV4YufW23gm=uwr7lkj+p0ykctkhxnm1rwfc+...@mail.gmail.com
Backpatch-through: 18

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d3f97fd1dda31d7bc925b226c2d9bec31bb7a6eb

Modified Files
--------------
src/backend/storage/aio/README.md | 5 +++--
src/include/storage/aio.h         | 2 +-
2 files changed, 4 insertions(+), 3 deletions(-)

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