Superfluous space before "It".

space after comma. Is the comma really necessary here?

no need to have a line break here.

Another line break here.

Ah, right, so this isn't very clear from looking at it, but "linux,phandle" is literally the name of an attribute that will get set, so the spacing here is important. I'm not sure if we have a better way to denote that, though?

It almost needs a .Va, but that seems a little too much. Perhaps just quoted, unless there's another macro that would fit.

The wrapping is correct -- thanks.
I'd add an 'a' in "for a bootloader", though.

Should we just say ".Nm
" (including newline) rather than "The utility"?

Do we need markup (.Va?) for "overlay"?

Ditto about markup for symbols

(and here)