Fix syntax error in origin-private-file-system example

[Mr0grog]

This just adds a missing quote to close a string in one of the code examples in the Origin Private File System blog post.

I just happened to notice this one while reading the post, but it seems like you could probably add a Remark plugin to flag these errors automatically. If it would be helpful, I’d be happy to take a look at setting up remark-lint-code and remark-lint-code-eslint for that (or something custom if you don’t like those or they don’t turn out to work well).

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[Mr0grog]

Still seems relevant?