docs: Run mdlint on core_runtime.md
docs: Run mdlint on core_runtime.md

Command used:
mdformat --compatibility -w ./platform/ec/docs/core_runtime.md

BRANCH=none
BUG=none
TEST=view in gitiles

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: I94d9f9580d3bca9b023d30eedcd0c8f408bef0da
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2464004
Reviewed-by: Diana Z <cb2016afc7183e5356c690dc63b4ba817470501a@chromium.org>

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