add doc for lnnvl feature - #300
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Add Chinese and English documentation for the Oracle compatible LNNVL function, following the two-document layout used for the other built-in functions: an implementation note under oracle_builtin_functions and a usage document under oracle_compatibility. The implementation notes cover the equivalence with the SQL standard IS NOT TRUE predicate, the SQL definition and the reason for each of its properties, why CALLED ON NULL INPUT is mandatory and what breaks if it is changed to STRICT, and function inlining. The usage documents cover the truth table, the partition property that distinguishes LNNVL from a plain NOT, the NOT IN over a NULL-containing subquery case, argument type checking, and the behavioural differences from Oracle, including that the accepted argument forms are a superset of Oracle's. Also fix a duplicated entry number in the English navigation, where dbtimezone was numbered 24 like the preceding entry; it is now 25, matching the Chinese navigation, and LNNVL follows as 26 in both.
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#301 Add Chinese and English documentation for the Oracle compatible LNNVL function.