Current json output example is not generically applicable to all checks

[mpacer]

When running on the PEP-0008.txt text, none of the output mentions any source for any of the advice.

Is that example out of date from the pre-"redesign module structure to avoid apparent endorsement" days? Is it actually out of date?

[mpacer]

note: proselint --demo --json | grep "source" returns nothing

[Nytelife26]

The example in the README is out of date. This will be addressed by applications of #1408, where the plan is to re-evaluate checks and their sources. Since many checks currently have missing or incorrect source references, it is not yet possible to rectify this.