x/pkgsite: example code should be displayed as package main when rendering

[fishy]

What is the URL of the page with the issue?

https://pkg.go.dev/github.com/reddit/baseplate.go@v0.0.0-20200327042237-1365288992e4/thriftclient?tab=doc#example-package

What did you expect to see?

On godoc.org, the Example* functions will be renamed to main when rendering, for example: https://godoc.org/github.com/reddit/baseplate.go/thriftclient#example-package

What did you see instead?

On pkg.go.dev we kept the original Example function name in the code.

[toothrot]

/cc @julieqiu

[julieqiu]

Thanks for reporting the bug, @fishy! We'll look into it.

/cc @dmitshur