https://docs.blender.org/manual/en/latest/addons/rigging/rigify/bone_positioning.html
I think there is a typo here,
Keeping aligned the mid bones in “brow”, “brow.b”, “lid.t”, “lid.t” and cheek will give better results after rig generation.
→ Keeping aligned the mid bones in “brow”, “brow.b”, “lid.t”, “lid.b” and cheek will give better results after rig generation.