[PATCH v4 4/4] clk: fractional-divider: Document the arithmetics used behind the code

[Stephen Boyd]

Quoting Andy Shevchenko (2021-08-12 10:00:25)
> It appears that some code lines raise the question why they are needed
> and how they are participated in the calculus of the resulting values.
> 
> Document this in a form of the top comment in the module file.
> 
> Reported-by: Liu Ying <victor.liu at nxp.com>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> ---

Applied to clk-next