doc: add bioRxiv link - Githubissues

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Closes #...

[X] This PR does NOT contain PHI or germline genetic data. A repo may need to be deleted if such data is uploaded. Disclosing PHI is a major problem.
[X] This PR does NOT contain molecular files, compressed files, output files such as images (e.g. .png, .jpeg), .pdf, .RData, .xlsx, .doc, .ppt, or other non-plain-text files. To automatically exclude such files using a .gitignore file, see here for example.
[X] I have read the code review guidelines and the code review best practice on GitHub check-list.
[X] The name of the branch is meaningful and well formatted following the standards, using [AD_username (or 5 letters of AD if AD is too long)]-[brief_description_of_branch].
[ ] I have added the major changes included in this pull request to the CHANGELOG.md under the next release version or unreleased, and updated the date.
[X] All test cases passed locally.