pgsql: Improve wording in the planner doc

Improve wording in the planner doc

Change "In this case" to "In the example above" to clarify what it
actually refers to.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/77c616a79dc9e852fa66cc69e6b4997511cc4dfa

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

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