When did Skuige Thairo become a thing?

Here's another thing you gotta know: nothing.
The Good News
Summaries can have multiple lines of markdown.
The Bad News
The markdown is restricted to having no empty lines, and it needs to be indented as if it were preformatted text. Example:
Summary:
### The Good News
Summaries can have ...
The Worse News
I can't find documentation on the format.
There is a FORMATTED_FIELDS setting described here.
What I've Discovered
Summary:
### The *Good* News
Summaries can be defined using multiple lines of markdown.
### The *Bad* News
The markdown is restricted. For example: no empty lines, and each line must be indented by four spaces.
### The *Worse* News
I can't find documentation on the format.
There is a `FORMATTED_FIELDS` setting described [here](https://docs.getpelican.com/en/4.9.1/settings.html).