pgsql: doc: remove mention of Windows junction points by pg_upgrade

doc: remove mention of Windows junction points by pg_upgrade

pg_upgrade never used Windows junction points but instead always used
Windows hard links.

Reported-by: Adrian Klaver

Discussion: /messages/by-id/6a638c60-90bb-4921-8ee4-5fdad68f8b09@aklaver.com

Backpatch-through: 9.3, where the mention first appeared

Branch
------
REL9_3_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ae58c15bd3f6447cbc67256bfb0b40d342b88fec

Modified Files
--------------
doc/src/sgml/pgupgrade.sgml | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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