Docs: Pedantry: [Cc]ordic -> CORDIC

According to:

  http://en.wikipedia.org/wiki/CORDIC



it stands for:

  *CO*ordinate *R*otation *DI*gital *C*omputer

Signed-off-by: Michael Witten <mfwitten@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>