Include PR recommendations

Author: marcrohloff

lib/grape_entity/entity.rb

@@ -554,7 +554,7 @@ def ensure_block_arity!(block)
       return if required_positional_arg_count.zero?
 
       raise ArgumentError, <<~MSG
-        Cannot use `&:#{origin_method_name}` because that method expects #{required_positional_arg_count} #{'argument'.pluralize(required_positional_arg_count)}.
+        Cannot use `&:#{origin_method_name}` because that method expects #{required_positional_arg_count} argument#{'s' if required_positional_arg_count != 1}.
         Symbol‐to‐proc shorthand only works for zero‐argument methods.
       MSG
     end

spec/grape_entity/entity_spec.rb

@@ -420,7 +420,7 @@ def method_with_optional_args_as_a_splat(*_optional_args)
               'result'
             end
 
-            def method_with_required_args_and_an_optional_splat(_required_arg, *_optional_argds)
+            def method_with_required_args_and_an_optional_splat(_required_arg, *_optional_args)
               'result'
             end