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_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ff339f4359424f4a8b5737168a749eff962d7f94

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

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