updated English text to reflect original Japanese

INSTALL

 * Compilation and Installation
 
-  1. Run make in top directory.
+  1. Run make in the top directory.
 
-     This command will create following directories and
+     This command will create the following directories and
      store libraries and binaries files into them.
 
        * bin
        * lib
        * include
 
-If you fail to compile ruby, please send the detailed error report with
-the error log and machine/OS type, to help others.
+If an error occurs when compiling mRuby, it will be helpful for others if you
+send a detailed report to the developers that includes the error log, machine,
+and OS type.
 
-* Porting to other platforms
 
+* Porting to other platforms
 
 
 That's all.

INSTALL.ja

@@ -8,6 +8,7 @@
 
        * bin
        * lib
+       * include
 
 もし，コンパイル時にエラーが発生した場合にはエラーのログとマ
 シン，OSの種類を含むできるだけ詳しいレポートを作者に送ってく