_content/doc/tutorial: add version prerequisite

[leimao]

Fixes golang/go#60627.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[gopherbot]

This PR (HEAD: e4d2ee2) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/website/+/557795.

Important tips:

• Don't comment on this PR. All discussion takes place in Gerrit.
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• To change your code in response to feedback:
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  • A new "patch set" will then appear in Gerrit.
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[gopherbot]

Message from Lei Mao:

Patch Set 2:

(1 comment)

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