single quotes

* README, README.ja: use single quotes for RDoc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35528 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

README

@@ -116,8 +116,8 @@ This is what you need to do to compile and install Ruby:
      * <tt>${DESTDIR}${prefix}/share/man/man1</tt>
      * <tt>${DESTDIR}${prefix}/share/ri/${MAJOR}.${MINOR}.${TEENY}/system</tt>
 
-     If Ruby's API version is `_x.y.z_', the <tt>${MAJOR}</tt> is `_x_', the
-     <tt>${MINOR}</tt> is `_y_', and the <tt>${TEENY}</tt> is `_z_'.
+     If Ruby's API version is '_x.y.z_', the <tt>${MAJOR}</tt> is '_x_', the
+     <tt>${MINOR}</tt> is '_y_', and the <tt>${TEENY}</tt> is '_z_'.
 
      *NOTE*: teeny of the API version may be different from one of
      Ruby's program version

README.ja

@@ -142,8 +142,8 @@ Ruby拡張モジュールについて話し合うruby-extメーリングリス
      * <tt>${DESTDIR}${prefix}/share/man/man1</tt>
      * <tt>${DESTDIR}${prefix}/share/ri/${MAJOR}.${MINOR}.${TEENY}/system</tt>
 
-     RubyのAPIバージョンが`_x.y.z_'であれば，<tt>${MAJOR}</tt>は
-     `_x_'で，<tt>${MINOR}</tt>は`_y_'，<tt>${TEENY}</tt>は`_z_'です．
+     RubyのAPIバージョンが'_x.y.z_'であれば，<tt>${MAJOR}</tt>は
+     '_x_'で，<tt>${MINOR}</tt>は'_y_'，<tt>${TEENY}</tt>は'_z_'です．
 
      <b>注意</b>: APIバージョンの+teeny+は，Rubyプログラムのバージョ
      ンとは異なることがあります．