[pl] Fix broken link to guestbook example

[Arhell]

https://github.com/kubernetes/website/pull/52498/files

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[dipesh-rawat]

The link fix looks in sync with 'en' PR https://github.com/kubernetes/website/pull/52498/files

LGTM

[dkarczmarski]

@dipesh-rawat
@Arhell
hi :) I have opened it already : #52674 but it has not been merged yet

[mfilocha]

/close

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