[internal] Update CoC with proper markdown + https links. (#12637)

* Fix markdown in `CODE_OF_CONDUCT.md`
* Fix broken link (see rust-lang/www.rust-lang.org#1212 (comment))

CODE_OF_CONDUCT.md

@@ -1,5 +1,4 @@
-Pants Code of Conduct
-=====================
+# Pants Code of Conduct
 
 This code of conduct outlines our expectations for participants within the
 Pants community, as well as steps for reporting unacceptable behavior. We
@@ -12,21 +11,20 @@ This code is not exhaustive or complete. It serves to distill our common
 understanding of a collaborative, shared environment, and goals. We expect
 it to be followed in spirit as much as in the letter.
 
-
 Our open source community strives to:
 
- * *Be friendly and patient.*
- * *Be welcoming:* We encourage everyone to participate and are committed to
+* *Be friendly and patient.*
+* *Be welcoming:* We encourage everyone to participate and are committed to
    building a community for all. Although we will fail at times, we seek to
    treat everyone as fairly and equally as possible. We strive to be a
    community that welcomes and supports people of all backgrounds and
    identities.
- * *Be considerate:* Your work will be used by other people, and you in turn
+* *Be considerate:* Your work will be used by other people, and you in turn
    will depend on the work of others. Any decision you take will affect users
    and colleagues, and you should take those outcomes into account when making
    decisions. Remember that we’re a world-wide community, so you might not be
    communicating in someone else’s primary language.
- * *Be respectful:* Not all of us will agree all the time, but disagreement is
+* *Be respectful:* Not all of us will agree all the time, but disagreement is
    no excuse for poor behavior and poor manners. We might all experience some
    frustration now and then, but we cannot allow that frustration to turn into
    a personal attack. It’s important to remember that a community where people
@@ -35,39 +33,38 @@ Our open source community strives to:
    responsibility for it. If someone has been harmed or offended, it is our
    responsibility to listen carefully and respectfully, and do our best to
    right the wrong.
- * *Be careful in the words that we choose:* we are a community of
+* *Be careful in the words that we choose:* we are a community of
    professionals, and we conduct ourselves professionally. Be kind to others.
    Do not insult or put down other participants. Harassment and other
    exclusionary behavior isn’t acceptable.
- * *Try to understand why we disagree:* Disagreements, both social and
+* *Try to understand why we disagree:* Disagreements, both social and
    technical, happen all the time. It is important that we resolve
    disagreements and differing views constructively. Remember that the strength
    of our community comes from different people have different perspectives on
    issues. Being unable to understand why someone holds a viewpoint doesn’t
    mean that they’re wrong. Don’t forget that it is human to err and blaming
    each other doesn’t get us anywhere. Instead, focus on helping to resolve
    issues and learning from mistakes.
- * *Be inclusive:* Although this list cannot be exhaustive, we explicitly honor
+* *Be inclusive:* Although this list cannot be exhaustive, we explicitly honor
    diversity in age, gender, gender identity or expression, culture, ethnicity,
    language, national origin, political beliefs, profession, race, religion,
    sexual orientation, socioeconomic status, and technical ability. We will not
    tolerate discrimination based on any of the protected characteristics above,
    including participants with disabilities.
 
-Reporting Issues
-----------------
+## Reporting Issues
 
 If you have experienced or witnessed unacceptable behavior—or have any other
 concerns—please report it by contacting us via pants-conduct@googlegroups.com.
 All reports will be handled with discretion. In your report please include:
 
- * Your contact information.
- * Names (real, nicknames, or pseudonyms) of any individuals involved. If there
+* Your contact information.
+* Names (real, nicknames, or pseudonyms) of any individuals involved. If there
    are additional witnesses, please include them as well. Your account of what
    occurred, and if you believe the incident is ongoing. If there is a publicly
    available record (e.g. a mailing list archive or a slack history), please
    include a link.
- * Any additional information that may be helpful.
+* Any additional information that may be helpful.
 
 After filing a report, a representative will contact you personally, review the
 incident, follow up with any additional questions, and make a decision as to
@@ -80,21 +77,18 @@ make an alternative reporting chain available in the event you need to report a
 project lead or a member of the response team. The members of the response team
 can be found in [COMMITTERS.md](https://github.com/pantsbuild/pants/blob/main/COMMITTERS.md#active-committers).
 
-
-Attribution & Acknowledgements
-------------------------------
+## Attribution & Acknowledgements
 
 This code of conduct is based on the
-[Open Code of Conduct v1.0](https://github.com/todogroup/opencodeofconduct) from the [TODOGroup](http://todogroup.org/).
-
+[Open Code of Conduct v1.0](https://github.com/todogroup/opencodeofconduct) from the [TODOGroup](https://todogroup.org/).
 
 We all stand on the shoulders of giants across many open source communities.
 We’d like to thank the communities and projects that established code of
 conducts and diversity statements as our inspiration:
 
- * [Django](https://www.djangoproject.com/conduct/reporting/)
- * [Python](https://www.python.org/community/diversity/)
- * [Ubuntu](http://www.ubuntu.com/about/about-ubuntu/conduct)
- * [Contributor Covenant](http://contributor-covenant.org/)
- * [Geek Feminism](http://geekfeminism.org/about/code-of-conduct/)
- * [Citizen Code of Conduct](http://citizencodeofconduct.org/)
+* [Django](https://www.djangoproject.com/conduct/reporting/)
+* [Python](https://www.python.org/community/diversity/)
+* [Ubuntu](https://www.ubuntu.com/about/about-ubuntu/conduct)
+* [Contributor Covenant](https://contributor-covenant.org/)
+* [Geek Feminism](https://geekfeminism.org/about/code-of-conduct/)
+* [Citizen Code of Conduct](https://github.com/stumpsyn/policies/blob/master/citizen_code_of_conduct.md)