Man page improvements

[ducaale]

Most of these proposed improvements are inspired by ripgrep:

• Mention that body can be piped to xh in the usage section.
• Briefly mention support for config files in the description section and have a dedicated section for it later.
• Mention the native-tls feature flag in the description section.
• Mention Strict compatibility mode in the description section.
• Mention https mode in the description section.
• Move the positional arguments section to outside of the options section.
• Remove any spaces between each flag and its help message.
• Mention --no-flag options in the description of the options section.
• Replace short_help+long_help with long_help if needed. (This is done by using long_help attribute instead of doc comments)
• Mention flags that affect other flags e.g --verbose enables --all or --json unsets --form.
• Document what each possible value does if necessary e.g the values that --pretty takes.
• Replace lists with a tabular format and use at least 4 spaces between columns.
• Evaluate alternatives to help2man including asciidoctor (used by ripgrep) and clap_mangen.