pgsql: Fix obsolete statement in smgr/README.

Fix obsolete statement in smgr/README.

Since commit 2d00190495b22e0d0ba351b2cda9c95fb2e3d083, fork numbers are
defined in relpath.h not relfilenode.h.

Fabrízio de Royes Mello

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/5307c993637674692ef71bcd41ff2412b03de914

Modified Files
--------------
src/backend/storage/smgr/README | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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