doc/66-tree: improve

doc/66-tree.html

@@ -52,7 +52,7 @@
 		<tt>-a&nbsp;<em>user</em></tt>&nbsp;: allow <em>user</em> to deal with
 		<em>tree</em>. <em>user</em> can be any valid user on the system. <em>user</em>
 		need to be the name of the user. A list of <em>user</em> separated by comma is allowed.
-		This options is used by <em>66-tree</em> to set the uid,gid at the compilation time of a services database. 
+		This options is used to set the uid,gid of a service database at the compilation time. 
 		That's mean that an undefined <em>user</em> is automatically denied for the given <em>tree</em>.
 		By default the current user of the process is automatically allowed when the <em>tree</em> is created.
 	 </li>