Fix api endpoints for Transport for NSW realtime feeds

[daviewales]

When I originally submitted these via the form, I missed the last component of the API endpoint.

Note that there are more options for these endpoints.
For example, you can replace /sydneytrains with /metro to get a different feed.

But I'm settling for just fixing the existing ones for now.

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[emmambd]

Thanks for this fix @daviewales!