Fix two errors for use in docs

[delucis]

Changes

• Uses a single template string instead of multiple joined together with +
  Docs doesn’t support parsing concatenated strings resulting in the following Markdown:

  > **PrerenderDynamicEndpointPathCollide**: Could not render `PATHNAME` with an `undefined` param as the generated path will collide during prerendering. ` +
           `Prevent passing `undefined` as `params` for the endpoint's `getStaticPaths()` function, ` +
           `or add an additional extension to the endpoint's filename. (E03026)
           `or add an additional extension to the endpoint's filename.

• Fixes an error that wasn’t being picked up because its comment opened with /* instead of /**.

Didn’t include a changeset as this is basically only a style change.

Testing

Existing tests should pass.

Docs

Docs-fix only.

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Latest commit: 1b523e4

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[sarah11918]

Thanks @delucis!