Fix typos and grammar

[t4sk]

@gitwinst Thanks. Please edit Function.sol. Not index.html.ts Also I think the grammar neither nor is correct

[gitwinst]

Gotcha! Will do now.

The neither/nor combination expresses negation all by itself, so it shouldn't be used in combination with another negative, i.e. 'cannot'. As such, this comment could be written two ways:

// Cannot use map for either input or output

// Can use map for neither input nor output

I think the first option does a better job at making your point: you cannot use a mapping type as a function's input or output parameters.