docs: showcase how to access remote function enhanced form results

[dr-starchildren]

Added additional details for using enhance example for remote functions, specifically how to access the results of a form submission when using enhance.

MCP with Claude and Gemini provided incorrect code attempting to use: const results = submit();

By specifying that results are on createPost.results, others can avoid the issue.

https://discord.com/channels/457912077277855764/1455909486408765510

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-15124-svelte.vercel.app/

[sillvva]

The form reset should be in the success block. You wouldn't want the form resetting if there are issues.

[dr-starchildren]

Moved form.reset() inside success check.
#15124 (comment)