restore a note about ln command from LFS 9.x

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@12168 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/glibc.xml

@@ -55,6 +55,15 @@
     ;;
 esac</userinput></screen>
 
+    <note>
+      <para>
+        The above command is correct.  The <command>ln</command> command has
+        a few syntactic versions, so be sure to check
+		<command>info coreutils ln</command> and <filename>ln(1)</filename>
+		before reporting what you may think is an error.
+	  </para>
+    </note>
+
     <para>Some of the Glibc programs use the non-FHS compliant
     <filename class="directory">/var/db</filename> directory to store their
     runtime data. Apply the following patch to make such programs store their