Adds a linter rule for markdown files so that new cases of "e.g."
without a comma wont be introduced to user-facing documentation.
Fixes the remaining cases of "e.g." in markdown files that are not
followed by a comma.
- Updates instances of "private message", "PM", and "private_message",
excluding historical references in `overview/changelog.md`.
- Also excludes `/docs/translating` since we would need new
translations for "direct messages" and "DMs".
This website has been defunct for years, and seems unlikely to return.
I have removed the dead link to citizencodeofconduct.org that
consistently breaks the `tools/test-documentation` test tool.
Lauryn Menard
David Rosa
Anders Kaseorg
Alya Abbott
Adam Birds
Anders Kaseorg
Mohit Maroliya
Cynthia Lin