COIL: Update documentation with appropriate branch names
COIL: Update documentation with appropriate branch names

Branch names have changed as part of go/coil initiative.

BUG=b:165682717
BRANCH=none
TEST=none

Signed-off-by: 786f72b733080adb5fadcecb1c77e128819696ad@chromium.org
Change-Id: I901984a7786ca31d4b8d85492fc4a7953080c6e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2667026
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec