This PR changes the Markdown language defaults to set `format_on_save`
to be `off`.
Prettier's Markdown formatting is a bit controversial for some people,
so we turn it off by default.
To restore the previous behavior, add the following to your settings:
```json
{
"languages": {
"Markdown": {
"format_on_save": "on"
}
}
}
```
Release Notes:
- Changed the default `format_on_save` behavior for Markdown files to be
`off`.
adecbd1815