[Patch v2 2/4] doc: add more information on operators.

[W. Trevor King]

On Mon, Feb 23, 2015 at 09:05:35PM +0100, David Bremner wrote:
> +In addition to individual terms, multiple terms can be combined with
> +Boolean operators (**and**, **or**, **not**, and **xor**). Each term
> +in the query will be implicitly connected by a logical AND if no
> +explicit operator is provided, (except that terms with a common prefix
> +will be implicitly combined with OR).  The shorthand '-<term>' can be used for 'not <term>' but
> +unfortunately this does not work at the start of an expression.
>  Parentheses can also be used to control the combination of the Boolean
>  operators, but will have to be protected from interpretation by the
>  shell, (such as by putting quotation marks around any parenthesized
>  expression).

We should probably:

* Re-wrap the paragraph to avoid one long line.
* Drop the comma before the “(except …)” parens.

Cheers,
Trevor

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