The best way to achieve this is to use some styling (font style and color).
Attached you will find two different options I worked on very quickly.
I really like the first. Just a couple of suggestions I would make:
- leave a space between the function name and (. Regardless of opinions on what source code should look like, your documentation has space between each parameter and the next one, and between the ) and the -> and the ->. and the return type so it seems crowded not to have space between the function name and the (.
- At this point it's not really a table any more; I would get rid of the lines, maybe tweak the spacing, and possibly use <dl> <dt> <dd> (definition list) rather than table-related HTML elements. See https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dl.
I think the bolding really makes stand out the crucial parts one needs to find.
