Improve comment for struct BufferDesc.

Add a note that per-buffer I/O condition variables currently live
outside the BufferDesc struct.  Follow-up for commit d8725104.

Reported-by: Julien Rouhaud <[email protected]>
Discussion: https://postgr.es/m/20210311031118.hucytmrgwlktjxgq%40nol

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/049d9b872db8a24b45709dbaed9a1051e92ed513

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

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