Fix typo

Author: sue445

_tools/ruby_h_to_go/lib/ruby_h_to_go/argument_definition.rb

@@ -20,7 +20,7 @@ def initialize(definition:)
       "var"   => "v",
       "func"  => "fun",
       "range" => "r",
-      "type"  => "r",
+      "type"  => "t",
 
       # Can't use "_" as a value
       "_"     => "arg",

_tools/ruby_h_to_go/spec/ruby_h_to_go/function_definition_spec.rb

@@ -457,10 +457,10 @@
           // Original definition is following
           //
           //	rb_data_typed_object_make(VALUE klass, const rb_data_type_t *type, void **datap, size_t size)
-          func RbDataTypedObjectMake(klass VALUE, r *RbDataTypeT, datap *unsafe.Pointer, size SizeT) VALUE {
-          var cR C.rb_data_type_t
-          ret := VALUE(C.rb_data_typed_object_make(C.VALUE(klass), &cR, datap, C.size_t(size)))
-          *r = RbDataTypeT(cR)
+          func RbDataTypedObjectMake(klass VALUE, t *RbDataTypeT, datap *unsafe.Pointer, size SizeT) VALUE {
+          var cT C.rb_data_type_t
+          ret := VALUE(C.rb_data_typed_object_make(C.VALUE(klass), &cT, datap, C.size_t(size)))
+          *t = RbDataTypeT(cT)
           return ret
           }