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
------
REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/0c96744a8769c4651c8ecce91762b6c606bb01ae

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

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