pgsql: pg_upgrade: document link options

pg_upgrade: document link options
Document that tablespaces and pg_xlog can be on different file systems
for pg_upgrade --link mode.
Backpatch to 9.3.

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/bf8d8ddc08b9573d1b6ed2ef24c83db5fef18d8c

Modified Files
--------------
doc/src/sgml/pgupgrade.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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