x/website: double anchor on hover for /pkg/?m=old docs

[3052]

What is the URL of the page with the issue?

https://go.dev/pkg/fmt?m=old#Print

What is your user agent?

Mozilla Firefox

Screenshot

What did you do?

!

What did you see happen?

!

What did you expect to see?

!

[gabyhelp]

Related Issues

• x/pkgsite: link to custom links is broken. #50387 (closed)
• x/pkgsite: duplicate drop down button
  #56521 (closed)

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[gopherbot]

Change https://go.dev/cl/669815 mentions this issue: _content: don't double anchors for old pkg docs