correct a typo

[skip ci]

Author: JonRowe

spec/rspec/core/configuration_spec.rb

@@ -1465,7 +1465,7 @@ def metadata_hash(*args)
         config.deprecation_stream = StringIO.new
       end
 
-      it 'doesnt immediately trigger formatter setup' do
+      it 'does not immediately trigger formatter setup' do
         config.reporter
 
         expect(config.formatters).to be_empty