docs: fix tmpfile('f2.txt') example output filename

[Aparajith24]

What

Fixes a typo in the tmpfile() example in docs/api.md. The example shows:

f2 = tmpfile('f2.txt') // /os/based/tmp/zx-1ra1iofojgg/foo.txt

The output comment says foo.txt, but it should be f2.txt to match the filename actually passed into tmpfile().

Why

This is confusing for anyone reading the docs to understand how tmpfile() works — the output path doesn't match the input, making it look like the function renames the file for no reason.

Change

Updated the comment from foo.txt to f2.txt in the example.

Fixes #1469

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[Aparajith24]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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