doc: Clarify the description of postmaster.pid fields

Document the postmaster status and note that the shared memory field
is empty on Windows. Also mention the shared memory segment ID in
the pidfile.h comment.

This is a follow-up of commit fa5ecff759b.

Author: Fujii Masao <[email protected]>
Reviewed-by: Laurenz Albe <[email protected]>
Discussion: 
https://postgr.es/m/CAHGQGwGQRpEyTdoHJr86x=jmf4413e87mk3jai09uvsvuot...@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/1a29680f9b1eaca15d4a3f8da3bca094452cdb25

Modified Files
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doc/src/sgml/storage.sgml   | 4 +++-
src/include/utils/pidfile.h | 2 +-
2 files changed, 4 insertions(+), 2 deletions(-)

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