add raccrt, strscan entry

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2259 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

doc/NEWS

@@ -22,6 +22,10 @@
 
     Dir.glob("makefile", File::FNM_CASEFOLD) #=> ['Makefile', 'makefile']
 
+: racc runtime module
+
+  Imported. Racc runtime library (Racc is a parser generator for ruby).
+
 : tsort module
 
   Imported.  Topological sorting library.
@@ -30,6 +34,10 @@
 
   Imported.  Pseudo (({IO})) class from/to (({String})).
 
+: strscan module
+
+  Imported.  Fast string scanner library.
+
 : Array#pack, String#unpack
 
   allows comment in template strings.