install/kubernetes: add documentation for "bandwidthManager" value
install/kubernetes: add documentation for "bandwidthManager" value

Add a comment to implement the TODO and provide some documentation for
the "bandwidthManager" value in the yaml file.

Signed-off-by: Quentin Monnet <d6b8e48afb2534b213e391cab43016505747a234@isovalent.com>

tgraf/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,tklauser/cilium