Rewrite a paragraph to make it less confusing.

svn path=/head/; revision=9970

en_US.ISO8859-1/books/handbook/users/chapter.sgml

@@ -1,7 +1,7 @@
 <!--
      The FreeBSD Documentation Project
 
-     $FreeBSD: doc/en_US.ISO8859-1/books/handbook/users/chapter.sgml,v 1.14 2001/07/17 21:35:41 murray Exp $
+     $FreeBSD: doc/en_US.ISO8859-1/books/handbook/users/chapter.sgml,v 1.15 2001/07/17 23:33:28 chern Exp $
 -->
 
 <chapter id="users">
@@ -805,13 +805,15 @@ teamtwo:*:1100:jru</screen>
     </example>
 
     <para>The argument to the <option>-M</option> option is a
-      comma-delimited list of users who are members of the group.  If
-      you've read the preceeding sections, you'll know that the password
-      file also contains a group for each user; the group in the password
-      file is automatically added to the group list by the system and will
-      not (should not) appear in the list of members when using &man.pw.8;
-      to query group membership.  If you wish to find out what groups a
-      user is part of, you can use the &man.id.1; program as so:</para>
+      comma-delimited list of users who are members of the group.  From the
+      preceding sections, we know that the password file also contains a
+      group for each user.  The latter (the user) is automatically added to
+      the group list by the system; the user will not show up as a member
+      when using the <command>groupshow</command> command to &man.pw.8;,
+      but will show up when the information is queried via &man.id.1; or
+      similar tool.  In other words, &man.pw.8; only manipulates the
+      <filename>/etc/group</filename> file; it will never attempt to read
+      additionally data from <filename>/etc/passwd</filename>.</para>
 
     <example>
       <title>Using &man.id.1; to determine group membership</title>