hcidoc: fix the number of ACL connections

Previously an update is made to support distinguishing BREDR and LE
connections which changed the data type of DeviceInformation::acls.
The output that prints the number of ACL connections was not updated
and thus will always shows 2.

This CL fixes it.

Bug: 293397988
Test: m -j
Flag: EXEMPT, floss only changes
Change-Id: I6eb3f1f58ec771921c21cff27ce56dd1e93d9b83