docs: clean up the serverFunctions.onError JSDoc

[adipascu]

PR Checklist

Please check if your PR fulfills the following requirements:

• Addresses an existing open issue: fixes #000
• Tests for the changes have been added (for bug fixes / features)

What is the current behavior?

Cleanup of my own JSDoc from #2262. serverFunctions.onError is documented too thinly to write a handler from, and ServerFunctionErrorHandler has no doc at all.

What is the new behavior?

Behavior unchanged, documentation only. The option now states that:

• a thrown Response reaches the handler, so replacing everything breaks redirect()
• the return value is not awaited
• only calls arriving over /_server reach it

ServerFunctionErrorHandler gets @param, @returns, and an @example, and the inert /** @internal */ is dropped.

Other information

Comments only, so no tests and no changeset.

Paired with solidjs/solid-docs#1610, which expands the config reference page for this option.

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