doc/go1.17: document archive/zip changes for Go 1.17

[aaronsheah]

For #44513. Fixes #46000

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[aaronsheah]

@googlebot I signed it!

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This PR (HEAD: e63461b) has been imported to Gerrit for code review.

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Patch Set 1:

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Message from Heschi Kreinick:

Patch Set 1: Code-Review+2

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Message from Robert Findley:

Patch Set 1: Trust+1

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This PR is being closed because golang.org/cl/320809 has been merged.