io/ioutil: fix example test for WriteFile to allow it to run in the playground

[pantonshire]

The example for WriteFile assumed the existence of a testdata/ directory, which is not present on the playground. The example now writes the file to the current working directory, rather than to testdata/.

Fixes #32916

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Message from Ian Lance Taylor:

Patch Set 1:

(1 comment)

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Patch Set 2:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 2: Run-TryBot+1

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Patch Set 2:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=9157eea3

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Patch Set 2: TryBot-Result+1

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Message from Ian Lance Taylor:

Patch Set 2: Code-Review+2

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Message from Bryan C. Mills:

Patch Set 2: Trust+1

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This PR is being closed because golang.org/cl/284452 has been merged.