Fix broken external link (#9496)

website/pages/docs/templates/engine.mdx

@@ -273,7 +273,7 @@ Formatting for the function `isotime` uses the magic reference date **Mon Jan 2
 _The values in parentheses are the abbreviated, or 24-hour clock values_
 
 For those unfamiliar with GO date/time formatting, here is a link to the
-documentation: [go date/time formatting](https://programming.guide/go/format-parse-string-time-date-example)
+documentation: [go date/time formatting](https://programming.guide/go/format-parse-string-time-date-example.html)
 
 Note that "-0700" is always formatted into "+0000" because `isotime` is always
 UTC time.