[sqlite] error in example rank function

[AJ ONeal]

Back to looking at http://www.sqlite.org/fts3.html#appendix_a

Notice the line:

    if( nVal!=(1+nCol) ) goto wrong_number_args;

nVal will always be 2 with the given use case:

    rank(matchinfo(documents), documents_data.weight)

or in the previous use case it will be 1

    rank(matchinfo(documents))

Seems that it would be best to assign a default weight of 1 if nVal == 1 or
the double value of apVal[1] otherwise.

Also the line

    double weight = sqlite3_value_double(apVal[iCol+1]);

should be simplified to:

    double weight = sqlite3_value_double(apVal[1]);

AJ ONeal
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