docs(api): fix tmpfile('f2.txt') example to show matching output filename

[kiwigitops]

Fixes #1469.

In docs/api.md under the tmpfile() section (line 331), the inline comment showed an output filename that didn't match the input argument — tmpfile('f2.txt') was annotated with a path ending in foo.txt. Since tempfile(name) in src/goods.ts does path.join(tempdir(), name), the result for tmpfile('f2.txt') ends in f2.txt.

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

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[kiwigitops]

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