Update QREF/Bartiq integration demo notebook (#1344)

* Update demo notebook

* Update format and capilize titles

* Corrected spelling

* Spelling correction

Co-authored-by: Michał Stęchły <michal.stechly@gmail.com>

* Rephrase Alias Sampling method

Co-authored-by: Michał Stęchły <michal.stechly@gmail.com>

* Numeric Implementation wording

Co-authored-by: Michał Stęchły <michal.stechly@gmail.com>

* Rewording details of evaluate

Co-authored-by: Michał Stęchły <michal.stechly@gmail.com>

* Clear outputs

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Co-authored-by: Michał Stęchły <michal.stechly@gmail.com>
Co-authored-by: Matthew Harrigan <mpharrigan@google.com>

Author: 3 people