Guides: output valid HTML5

[ci skip]

5 files changed, 6 insertions, 7 deletions

diff --git a/guides/source/2_3_release_notes.md b/guides/source/2_3_release_notes.md
index 8c633fa169..2302a618b6 100644
--- a/guides/source/2_3_release_notes.md
+++ b/guides/source/2_3_release_notes.md
@@ -594,7 +594,7 @@ The internals of the various <code>rake gem</code> tasks have been substantially
 * Various files in /public that deal with CGI and FCGI dispatching are no longer generated in every Rails application by default (you can still get them if you need them by adding `--with-dispatchers` when you run the `rails` command, or add them later with `rake rails:update:generate_dispatchers`).
 * Rails Guides have been converted from AsciiDoc to Textile markup.
 * Scaffolded views and controllers have been cleaned up a bit.
-* `script/server` now accepts a <tt>--path</tt> argument to mount a Rails application from a specific path.
+* `script/server` now accepts a `--path` argument to mount a Rails application from a specific path.
 * If any configured gems are missing, the gem rake tasks will skip loading much of the environment. This should solve many of the "chicken-and-egg" problems where rake gems:install couldn't run because gems were missing.
 * Gems are now unpacked exactly once. This fixes issues with gems (hoe, for instance) which are packed with read-only permissions on the files.
 
@@ -618,4 +618,4 @@ A few pieces of older code are deprecated in this release:
 Credits
 -------
 
-Release notes compiled by [Mike Gunderloy](http://afreshcup.com.) This version of the Rails 2.3 release notes was compiled based on RC2 of Rails 2.3.
+Release notes compiled by [Mike Gunderloy](http://afreshcup.com). This version of the Rails 2.3 release notes was compiled based on RC2 of Rails 2.3.
diff --git a/guides/source/3_0_release_notes.md b/guides/source/3_0_release_notes.md
index 2d4be0cda7..db34fa401f 100644
--- a/guides/source/3_0_release_notes.md
+++ b/guides/source/3_0_release_notes.md
@@ -608,4 +608,4 @@ Credits
 
 See the [full list of contributors to Rails](http://contributors.rubyonrails.org/) for the many people who spent many hours making Rails 3. Kudos to all of them.
 
-Rails 3.0 Release Notes were compiled by [Mikel Lindsaar](http://lindsaar.net.)
+Rails 3.0 Release Notes were compiled by [Mikel Lindsaar](http://lindsaar.net).
diff --git a/guides/source/active_support_instrumentation.md b/guides/source/active_support_instrumentation.md
index 121cdc0199..d947c5d9d5 100644
--- a/guides/source/active_support_instrumentation.md
+++ b/guides/source/active_support_instrumentation.md
@@ -17,7 +17,7 @@ After reading this guide, you will know:
 Introduction to instrumentation
 -------------------------------
 
-The instrumentation API provided by Active Support allows developers to provide hooks which other developers may hook into. There are several of these within the Rails framework, as described below in <TODO: link to section detailing each hook point>. With this API, developers can choose to be notified when certain events occur inside their application or another piece of Ruby code.
+The instrumentation API provided by Active Support allows developers to provide hooks which other developers may hook into. There are several of these within the Rails framework, as described below in (TODO: link to section detailing each hook point). With this API, developers can choose to be notified when certain events occur inside their application or another piece of Ruby code.
 
 For example, there is a hook provided within Active Record that is called every time Active Record uses an SQL query on a database. This hook could be **subscribed** to, and used to track the number of queries during a certain action. There's another hook around the processing of an action of a controller. This could be used, for instance, to track how long a specific action has taken.
 
diff --git a/guides/source/index.html.erb b/guides/source/index.html.erb
index 57c224c165..2fdf18a2e9 100644
--- a/guides/source/index.html.erb
+++ b/guides/source/index.html.erb
@@ -9,6 +9,7 @@ Ruby on Rails Guides
 <% content_for :index_section do %>
 <div id="subCol">
   <dl>
+    <dt></dt>
     <dd class="kindle">Rails Guides are also available for <%= link_to 'Kindle', @mobi %>.</dd>
     <dd class="work-in-progress">Guides marked with this icon are currently being worked on and will not be available in the Guides Index menu. While still useful, they may contain incomplete information and even errors. You can help by reviewing them and posting your comments and corrections.</dd>
   </dl>
diff --git a/guides/source/layout.html.erb b/guides/source/layout.html.erb
index 1ac4e7f40c..1d375f806c 100644
--- a/guides/source/layout.html.erb
+++ b/guides/source/layout.html.erb
@@ -1,5 +1,4 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<!DOCTYPE html>
 
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
@@ -78,7 +77,6 @@
           </select>
         </li>
       </ul>
-      </div>
     </div>
   </div>
   <hr class="hide" />