Fix enumerator doc errors

mrbgems/mruby-enumerator/mrblib/enumerator.rb

@@ -6,9 +6,9 @@
 # A class which allows both internal and external iteration.
 #
 # An Enumerator can be created by the following methods.
-# - Kernel#to_enum
-# - Kernel#enum_for
-# - Enumerator.new
+# - {Kernel#to_enum}
+# - {Kernel#enum_for}
+# - {Enumerator#initialize Enumerator.new}
 #
 # Most methods have two forms: a block form where the contents
 # are evaluated for each item in the enumeration, and a non-block form
@@ -90,9 +90,8 @@ class Enumerator
   include Enumerable
 
   ##
-  # call-seq:
-  #   Enumerator.new(size = nil) { |yielder| ... }
-  #   Enumerator.new(obj, method = :each, *args)
+  # @overload initialize(size = nil, &block)
+  # @overload initialize(obj, method = :each, *args)
   #
   # Creates a new Enumerator object, which can be used as an
   # Enumerable.
@@ -189,8 +188,7 @@ class Enumerator
   #
   # If no block is given, returns a new Enumerator.
   #
-  # === Example
-  #
+  # @example
   #   to_three = Enumerator.new do |y|
   #     3.times do |x|
   #       y << x