[sv-ac] hier refernce as bind target

LRM says than as bind_target_instance_list may be a hierarchical reference -
but there is no such examples in LRM.

I'm not sure if this how hierarchical reference should work in this context.

Those hierarchical identifiers should be relative to context where bind is
placed or relative to bind target?

I assume that global hier refs or hier refs starting with $root are also
allowed.

Snippet from LRM:

bind bind_target_scope [: bind_target_instance_list] bind_instantiation ;

bind_target_instance ::=

   hierarchical_identifier constant_bit_select

bind_target_instance_list ::=

   bind_target_instance { , bind_target_instance }

bind bind_target_scope : hierarchical_identifier constant_bit_select
bind_instantiation ;

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