linuxdoc validation improvement

document had <sect3> children of <sect1>; processor complained about
it, but produced output, just quelling some of the noise.

LDP/howto/linuxdoc/4mb-Laptops.sgml

@@ -236,7 +236,7 @@ Slackware is a distribution designed by one person. I'm sure Patrick Volkerding
 </p> <p>
 Version 7.0 was the latest version when I tried this so that's what I used.
  </p>
- <sect3>
+ <sect2>
 But I don't like Slackware!
  <p>
 You don't have to use it. I can't answer for all the distributions but
@@ -264,7 +264,7 @@ Floppy Install</tag>This means churning out 15 floppies - which only gives
 Parallel-port Install</tag>Where the parallel port has an IDE device,
  parallel cable or pocket ethernet adaptor  <footnote>
 A pocket lan adaptor installation onto these machines will be <em>very</em> slow.  </footnote>
-</tag>attached. This would be a good choice for the Aero, leaving the
+attached. This would be a good choice for the Aero, leaving the
  PCMCIA slot free to run the floppy drive.
   <tag>
 PCMCIA Install</tag>As above, this could be a CD-ROM or network install.
@@ -724,7 +724,7 @@ Most of the packages in this category are essential, even those that aren't
  those packages that I felt could reasonably be left out rather than all the
  non-compulsory packages that I installed.
  </p>
- <sect3>
+ <sect2>
 Packages considered for omission:
  <p>
  <descrip>
@@ -777,7 +777,7 @@ scsimods</tag>No use on these laptops. Omitted.
 sysklogd</tag>This can interfere with apmd but it does provide essential
  information. Included.
  </descrip>
-</p> <sect3>
+</p> <sect2>
 Packages installed:
  <p>
 aaa_base, bash, bash1, bin, bzip2, cpio, cxxlibs, devs, e2fsprog, elflibs,
@@ -796,7 +796,7 @@ None of these packages are, strictly speaking, essential - although ash
  save the vital space for you to squeeze in your favourite app. I selected a
  minimal set of tools that I don't like to do without.
  </p>
- <sect3>
+ <sect2>
 Packages considered for inclusion:
  <p>
  <descrip>
@@ -869,7 +869,7 @@ You could fit C or C++ into this space but the glibc library package is
  <p>
 There is room for Perl and Python. 
  </p>
- <sect3>
+ <sect2>
 Packages installed:
  <p>
 None
@@ -886,7 +886,7 @@ If you do want Emacs it might be an idea to leave this out while doing
  the core installation. Once the laptop is up you can try fitting in what you
  want/need at your leisure.
  </p>
- <sect3>
+ <sect2>
 Packages installed:
  <p>
 None.
@@ -896,7 +896,7 @@ F - FAQs and HOWTOs
  <p>
 If you know it all you don't need these. I installed the lot.
  </p>
- <sect3>
+ <sect2>
 Packages installed:
  <p>
 howto, manyfaqs, mini
@@ -910,7 +910,7 @@ K - Kernel Source
 You can just squeeze it in. If all you want to do is read the source, go
  ahead. 
  </p>
- <sect3>
+ <sect2>
 Packages Installed:
  <p>
 None
@@ -921,7 +921,7 @@ N - Networking Tools and Apps
 These packages were selected to provide core networking tools, dial-up
  capability, e-mail, web and news.
  </p>
- <sect3>
+ <sect2>
 Packages installed:
  <p>
 dip, elm, fetchmail, mailx, lynx, netmods, netpipes, ppp, procmail, trn,
@@ -936,7 +936,7 @@ Tetex
 Another set that will barely squeeze in. I can't say how it would run in
  the space available. 
  </p>
- <sect3>
+ <sect2>
 Packages installed:
  <p>
 None
@@ -947,7 +947,7 @@ Y - BSD Games Collection
 I'm addicted to several of these. If I really need that last 5mb they can
  go.
  </p>
- <sect3>
+ <sect2>
 Packages installed:
  <p>
 bsdgames