RFA: Tweak documentation of fma

[Richard Henderson]

On 02/03/2015 06:29 AM, Richard Sandiford wrote:
>  Represents the @code{fma}, @code{fmaf}, and @code{fmal} builtin
> -functions that do a combined multiply of @var{x} and @var{y} and then
> -adding to@var{z} without doing an intermediate rounding step.
> +functions, which compute @samp{@var{x} * @var{y} + @var{z}}
> +without doing an intermediate rounding step.

Ok.


r~