docs(autofill-credentials): Add warning about hostname and apis

[alexcroox]

A big footgun for me when implementing server.hostname to match my live site was the app stopped working because it was making network requests to the same domain.com/api which Capacitor was routing internally to itself instead.

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Name	Status	Preview	Comments	Updated (UTC)
capacitor-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 17, 2023 11:17am

[pdrhlik]

This should definitely be in the docs. I spent hours figuring out why it didn't work although everything else was set up properly.

[jjgriff93]

Please can this be reviewed and merged, I've also wasted hours on this