For functions with many arguments, show one argument per line in intellisense documentation (or give option to do so)

[ldorigo]

Currently the popup docs for functions that accept many arguments wraps the function signature on multiple lines and is really hard to read, example from pandas read_excel:

IMO, it would be much tidier and more readable to have one argument (+ typing info) per line.

[ldorigo]

Or at least, maybe write argument names in bold or in a different color? The current tooltip is so hard to parse it's close to useless to me.

[judej]

Dupe of #301