Add details on attestation structure and parsing. (#14)

* Add details on attestation structure and parsing.

* bip-p2qrh.mediawiki:  Separating discussion about Grovers algorithm into
its own section.

* Update phrasing and formatting.

* Kyle fixes

* Add Jeff Bride to acknowledgments

* Apply suggestions from code review

Co-authored-by: Kyle Crews <[email protected]>

* Updates to clarity.

---------

Co-authored-by: jbride <[email protected]>
Co-authored-by: Kyle Crews <[email protected]>

Author: 3 people