This change brings the three top-level markdown documents (README,
CONTRIBUTING, and CODE_OF_CONDUCT) in line with standard markdown
formatting and styling, as informed by
markdownlint/markdownlint:docs/RULES.md@master
Primarily, it:
Hard-wraps long lines to be 80 characters or less, except for
long URLs and code blocks;
Uniformly wraps all code blocks in triple-backticks, and supplies
language information for syntax highlighting; and
Makes a few other small tweaks.
Aaron Gable