(maint) Improve message when type error is raised

Addresses @hlindberg's comment after PR #35 was closed.
Use the error message from the exception which is actually exactly what I
wanted to say anyway.

lib/puppet_x/puppetlabs/strings/yard/handlers/host_class_handler.rb

@@ -17,10 +17,9 @@ class PuppetX::PuppetLabs::Strings::YARD::Handlers::HostClassHandler < PuppetX::
       else
         begin
           param_type_info[pop_param.name] =  tp.interpret_any(pop_param.type_expr)
-        rescue Puppet::ParseError
+        rescue Puppet::ParseError => e
           # If the type could not be interpreted insert a prominent warning
-          param_type_info[pop_param.name] = "TypeError - " +
-            "#{pop_param.type_expr} isn't a valid type."
+          param_type_info[pop_param.name] = "Type Error: #{e.message}"
         end
       end
     end