Updated options-query_tool.rst file

Hi,

There are three undocumented fields on the Options/Query Tool dialog:

Thousands separator
Decimal mark
Copy column names

I've added the following column descriptions to the attached .rst file:

* **Thousands separator** - Use the *Thousands separator* field to specify a delimiter character that will be used to break a value into groups of three digits, counting left from the decimal mark.

* **Decimal mark** - Use the *Decimal mark* field to specify a delimiter character that will be used to break a number into an integer portion and a fractional portion.

* **Copy column names** - Check the box next to *Copy column names* to specify that when copying from the result grid, the column name should be included as the first row.

If the descriptions are correct, can you please apply the changes? Thanks!

-- Susan