Fix cols of reserved keywords table

The table of reserved keywords obviously has four columns, and this
should be reflected by the `col` attribute (although that is apparently
ignored by PhD for now).  We also specify four columns for the table of
soft reserved words.

php/doc-en@4e19b91

Author: mumumu

appendices/reserved.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: a6a4d6ad6e4ac5e1361044cf5ec6bdd730e529ae Maintainer: hirokawa Status: ready -->
+<!-- EN-Revision: 4e19b91a1985a2a94ae192534ad75e6c6d740ec4 Maintainer: hirokawa Status: ready -->
 <!-- CREDITS: takagi,mumumu -->
 
  <appendix xml:id="reserved" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
@@ -512,7 +512,7 @@
    <para>
     <table>
      <title>予約語</title>
-     <tgroup cols="5">
+     <tgroup cols="4">
       <tbody>
        <row>
         <entry>
@@ -568,7 +568,7 @@
    <para>
     <table>
      <title>弱い予約語</title>
-     <tgroup cols="5">
+     <tgroup cols="4">
       <tbody>
        <row>
         <entry>