(PUP-10025) fix top-level docs output from puppet describe

This fixes #208

Author: DavidS

lib/puppet/resource_api.rb

@@ -35,7 +35,8 @@ def register_type(definition)
     end
 
     Puppet::Type.newtype(definition[:name].to_sym) do
-      @docs = definition[:desc]
+      # The :desc value is already cleaned up by the TypeDefinition validation
+      @doc = definition[:desc]
       @type_definition = type_def
 
       # Keeps a copy of the provider around. Weird naming to avoid clashes with puppet's own `provider` member

spec/puppet/resource_api_spec.rb

@@ -61,7 +61,7 @@
 
       it { is_expected.not_to be_nil }
       it { is_expected.to be_respond_to :instances }
-      it { expect(type.instance_variable_get(:@docs)).to eq 'the docs' }
+      it { expect(type.instance_variable_get(:@doc)).to eq 'the docs' }
     end
   end