[pull] master from ruby:master

.document

@@ -15,10 +15,10 @@ array.rb
 ast.rb
 dir.rb
 gc.rb
+hash.rb
 io.rb
 kernel.rb
 marshal.rb
-rjit.rb
 numeric.rb
 nilclass.rb
 pack.rb
@@ -30,6 +30,10 @@ thread_sync.rb
 trace_point.rb
 warning.rb
 yjit.rb
+zjit.rb
+
+# Errno::*
+known_errors.inc
 
 # the lib/ directory (which has its own .document file)
 lib