Fix Arrar#fetch_values' documentation examples

array.rb

@@ -183,14 +183,14 @@ def last n = unspecified = true
   # at the offsets specified by +indexes+. Each of the +indexes+ must be an
   # {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects]:
   #
-  #    a = [:foo, :bar, :baz]
-  #    a.fetch_values(3, 1)   # => [:baz, :foo]
-  #    a.fetch_values(3.1, 1) # => [:baz, :foo]
-  #    a.fetch_values         # => []
+  #   a = [:foo, :bar, :baz]
+  #   a.fetch_values(2, 0)   # => [:baz, :foo]
+  #   a.fetch_values(2.1, 0) # => [:baz, :foo]
+  #   a.fetch_values         # => []
   #
   # For a negative index, counts backwards from the end of the array:
   #
-  #    a.fetch_values([-2, -1]) # [:bar, :baz]
+  #   a.fetch_values(-2, -1) # => [:bar, :baz]
   #
   # When no block is given, raises an exception if any index is out of range.
   #