docs:  use alias in WHERE clause of full text search example

The current doc query specified an alias in the FROM clause and used in
it the target list, but not in the WHERE clause.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/39ceaa275a2ba1397e24278803ca393cc1430050

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

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