Fix a typo

Co-authored-by: Hiroyuki Sato <[email protected]>

Author: kou

ruby/red-arrow-format/lib/arrow-format/type.rb

@@ -340,7 +340,7 @@ def build_array(size, validity_buffer, values_buffer)
 
   class MonthDayNanoIntervalType < IntervalType
     def initialize
-      super("MonthDayNanoTimeInterval")
+      super("MonthDayNanoInterval")
     end
 
     def build_array(size, validity_buffer, values_buffer)