Revert "Added specs for Enumerator#peek behaviour. When the Enumerator position is already at the end and method peek is called."
Revert "Added specs for Enumerator#peek behaviour. When the Enumerator position is already at the end and method peek is called."

This reverts commit 1728b8bcfd826e9105270d1ffa26a59724c250e0.

There's an existing spec for this:

https://github.com/rubyspec/rubyspec/blob/master/core/enumerator/peek_spec.rb#L33-36

ruby/spec,Aesthetikx/rubyspec,askl56/rubyspec,yous/rubyspec,askl56/rubyspec,eregon/rubyspec,nobu/rubyspec,yaauie/rubyspec,eregon/rubyspec,wied03/rubyspec,sgarciac/spec,lucaspinto/rubyspec,ruby/spec,chesterbr/rubyspec,benlovell/rubyspec,nobu/rubyspec,sgarciac/spec,yaauie/rubyspec,bl4ckdu5t/rubyspec,BanzaiMan/rubyspec,iliabylich/rubyspec,sgarciac/spec,lucaspinto/rubyspec,ruby/rubyspec,nobu/rubyspec,jannishuebl/rubyspec,eregon/rubyspec,kidaa/rubyspec,iliabylich/rubyspec,kidaa/rubyspec,chesterbr/rubyspec,ruby/spec,ruby/rubyspec,wied03/rubyspec,benlovell/rubyspec,bl4ckdu5t/rubyspec,BanzaiMan/rubyspec,kachick/rubyspec,wied03/rubyspec,Aesthetikx/rubyspec,yous/rubyspec,kachick/rubyspec,jannishuebl/rubyspec,kachick/rubyspec