[DOCS] Table 9-34 missing an entry in v8.2 documentation

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Page: https://www.postgresql.org/docs/8.2/static/functions-sequence.html
Description:

https://www.postgresql.org/docs/8.2/static/functions-sequence.html

The lastval() function is not listed in the 9-34 table, although it is
described later in the text. It is present in the table in the 8.1 and 8.3
documentation.