Re: [AD] Documentation update

[Chris <chris.kcat@xxxxxxxxxx>]

Peter Wang wrote:
>  @@fixed @fixsub(fixed x, fixed y);
>  @xref fixadd, fixmul, fixdiv
> +@shortdesc Safe function to substract fixed point numbers without overflow.
>     Fixed point subtraction: see comments about fixadd().
>
>  @hnode Fixed point trig
>
> "substract" -> "subtract"
>
> I think the "without overflow" is misleading, but I don't know what to replace 
> it with.

Perhaps "Function to substract fixed point numbers, safely clamping the 
result instead of overflowing."