fixup! Remove a mistakenly added line

Author: pirj

docs/modules/ROOT/pages/usage.adoc

@@ -29,7 +29,6 @@ In case you https://github.com/rspec/rspec-core/blob/b0d0843a285693c64cdbe0c8572
 [source,ruby]
 ----
 # spec/spec_helper.rb
-alias_example_group_to
 RSpec.configure do |c|
   c.alias_example_group_to :detail, :detailed => true
 end