Where are the docc files for the standard library?

[taylorswift]

when you visit the standard library docs, there are custom topics such as:

Creating a Binary Integer

Converting Integers

Converting Floating-Point Values

Converting with No Loss of Precision

Performing Calculations

where are the DocC files that specify these headings stored?

[krilnon (Kyle Murray)]

Symbol reference docs for the standard library come from the source repo, but the topic structure and some of the other content comes from the Apple Developer site.

[TimTr (Tim Triemstra)]

Also note that the standard library has not yet migrated to Swift-DocC as the base tooling for generating the docs, but that is indeed a goal.