[Skiboot] [PATCH] doc: clarify OPAL_RTC_READ return values

[Stewart Smith]

Stewart Smith <stewart at linux.ibm.com> writes:
> It's a quirky call. There was some discussion ages ago surrounding the
> fact that we barely document what it returns and when. So, umm... make
> it slightly less terrible, but still terrible.
>
> Signed-off-by: Stewart Smith <stewart at linux.ibm.com>

Merged to master as of c2c426ef668be5056ab272b188134f5ee54b8c2b

-- 
Stewart Smith
OPAL Architect, IBM.