docs: update to account for github changes

Jacky Zhao

2023-03-02 aa5ab03d4ad6e7cb4d9efd3f9c177ebde7e4c4af

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{{if .Date}}
{{.Date.Format "Jan 2, 2006"}}
{{else if .Lastmod}}
{{.Lastmod.Format "Jan 2, 2006"}}
{{else}}
Unknown
{{end}}