Add a 'Local path' field label and a doc link

[wojtekn]

Related issues

• Fixes https://github.com/Automattic/dotcom-forge/issues/10270

Proposed Changes

I propose to add a 'Local path' field label to explain accepted directory formats. I also propose adding a 'Learn more' link pointing to the documentation page, which explains this better.

Testing Instructions

1. Check if the 'Add site' form still works fine and allows selecting a local path
2. Validate the same in the Onboarding form
3. Validate if message is clear enough

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[ivan-ottinger]

The proposed changes look good and the new copy is clear to me. 👌🏼

The Add site and Onboarding forms are working correctly and I did not observe any regression.

There's just one styling issue I noticed: The vertical spacing is different when we compare the Import a backup vs Local path sections:

[wojtekn]

@ivan-ottinger good catch. I unified both fields' markups, and now, the spacing between the field name, label, and field itself should be consistent.

[ivan-ottinger]

@ivan-ottinger good catch. I unified both fields' markups, and now, the spacing between the field name, label, and field itself should be consistent.

Nice! The proposed changes look good. 👌🏼 The vertical spacing is consistent now: