Display constructor parameter types in the web reference

[kevinstadler]

The change brings the display of constructor signatures in line with how other fields (methods) are already displayed, compare: https://github.com/processing/processing-website/blob/bf271113a486db21fc00ffd3841cb6b70adfb7c8/src/templates/reference/field.js#L172-L176

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[SableRaf]

Thanks for the contribution @kevinstadler! ✨