Fix getStaticPaths example code

[balazsorban44]

In the upcoming getStaticPaths documentation, there seems to be a contradiction in what should be returned by this function.

In one place, it says it should look something like this:

return {
  paths: [
    { params: { id: 1 } },
    { params: { id: 2 } }
  ],
  fallback: ...
}

So paths contains a list of objects, where each item has a params property, that are objects themselves.

Although, in the example below fallback, paths was equal to posts mapped over to a list of strings (ids).

Closes #10894

[ijjk]

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webpack-HASH..dule.js gzip	746 B	746 B	✓
de003c3a9d30..dule.js gzip	6.71 kB	6.71 kB	✓
framework.HA..dule.js gzip	39.1 kB	39.1 kB	✓
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_app.js gzip	1.09 kB	1.09 kB	✓
_error.js gzip	2.96 kB	2.96 kB	✓
hooks.js gzip	664 B	664 B	✓
index.js gzip	222 B	222 B	✓
link.js gzip	1.89 kB	1.89 kB	✓
routerDirect.js gzip	279 B	279 B	✓
withRouter.js gzip	278 B	278 B	✓
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	zeit/next.js canary	balazsorban44/next.js patch-1	Change
_app.module.js gzip	594 B	594 B	✓
_error.module.js gzip	2.06 kB	2.06 kB	✓
hooks.module.js gzip	370 B	370 B	✓
index.module.js gzip	212 B	212 B	✓
link.module.js gzip	1.48 kB	1.48 kB	✓
routerDirect..dule.js gzip	271 B	271 B	✓
withRouter.m..dule.js gzip	270 B	270 B	✓
Overall change	5.26 kB	5.26 kB	✓

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	zeit/next.js canary	balazsorban44/next.js patch-1	Change
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_buildManife..dule.js gzip	61 B	61 B	✓
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[timneutkens]

Updated the example to correctly show passing of post.id. Both methods are supported btw, you can provide a full url instead of the object. But we're only showing the object in the docs for now, so good catch 💯

[balazsorban44]

That was fast! 🔥