Doc: query executor: extra 'get' in sentence

Doc: query executor: extra 'get' in sentence

The documentation specifies that:
"The query operation feature exists so that you can get benefit from a
[...]"

I think the author meant to use "[...] so that you can benefit from
[...]", which seems more idiomatic.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I0402c48bf18de8138344c230c0b82968ce8f7d5f
Reviewed-on: https://review.lttng.org/c/babeltrace/+/6867
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Tested-by: jenkins <jenkins@lttng.org>