[DOCS] alter_foreign_table.sgml typo

[Mehmet Emin KARAKAŞ]

Fixed typo in SQL.

Current: ALTER FOREIGN TABLE myschema.distributors OPTIONS (ADD opt1
'value', SET opt2 'value2', DROP opt3 'value3');

Fixed: ALTER FOREIGN TABLE myschema.distributors OPTIONS (ADD opt1 'value',
SET opt2 'value2', DROP opt3);

Drop options do not get a value.

-- 
MEHMET EMİN KARAKAŞ

0001-Fixed-typo-in-SQL.patch
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