Updated a benchmark description.

benchmark/parser/bench_big_xml_time.rb

@@ -5,7 +5,7 @@ xml    = File.read(File.expand_path('../../fixtures/big.xml', __FILE__))
 parser = Oga::XML::Parser.new(xml)
 
 Benchmark.bmbm(10) do |bench|
-  bench.report '11MB of XML' do
+  bench.report '10MB of XML' do
     parser.parse
   end
 end