2015/program/index.html: made HTML5 validation fixes

diff --git a/2015/program/index.html b/2015/program/index.html
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--- a/2015/program/index.html
+++ b/2015/program/index.html
@@ -143,14 +143,14 @@ Contents
                <div class="session">
                        <h4>Growing your free software project</h4>
                        <span class="speakers"><a href="/2015/program/speakers.html#gordon-mckeon">Shauna Gordon-McKeon</a></span>
-                       <p>Many free software projects are interested in growing their user and contributor bases, but it can be hard to know where to start. This workshop will go over some key first steps to growing a friendly and diverse community, such as:
+                       <p>Many free software projects are interested in growing their user and contributor bases, but it can be hard to know where to start. This workshop will go over some key first steps to growing a friendly and diverse community, such as:</p>
 
                                <ul>
                                        <li>Making sure your “Getting Started” materials, such as installation and contributor guides, are accurate and accessible</li>
                                        <li>Running quick user tests and processing the feedback</li>
                                        <li>Promoting your project through social media and in-person events</li>
                                </ul>
-                       </p>
+
 
                        <p>After an introductory presentation, the audience will break out into groups and work on activities designed to make taking these steps as easy as possible. Individuals will have the opportunity to try out multiple activities. Those who do not currently have a free software project to contribute to will be paired with those who do, and can learn these useful skills to apply in the future.</p>
 
@@ -186,7 +186,7 @@ Contents
                        <span class="speakers"><a href="/2015/program/speakers.html#sturmfels">Ben Sturmfels</a></span>
                        <p>Are you someone who loves Emacs, but has never understood its strange code with lots of brackets? You're missing out on one of the great joys of Emacs-- customizing it to work exactly the way you want. It turns out that Emacs is little more than an interpreter for Lisp code, and once you know a little Emacs Lisp, almost anything is possible.</p>
 
-                       <p>After attending this tutorial, you will know how to:
+                       <p>After attending this tutorial, you will know how to:</p>
                                <ul>
                                        <li>make persistent customizations to your Emacs</li>
                                        <li>read basic Emacs Lisp code</li>
@@ -197,17 +197,17 @@ Contents
                                        <li>use built-in Emacs Lisp development tools like the debugger</li>
                                        <li>write your own reusable modules for Emacs customizations</li>
                                </ul>
-                       </p>
+
 
                        <p>The tutorial will have some interactive components, so bringing a laptop is recommended. Sharing with a friend will work well too, though. This tutorial will be enjoyed most if you already have a little programming experience.</p>
 
-                       <p>Installation requirements:
+                       <p>Installation requirements:</p>
                                <ul>
                                        <li>GNU Emacs 24 (though 23 would probably work as well)</li>
                                        <li>Emacs Lisp source files (emacs24-el in Debian)</li>
                                        <li>Emacs documentation in Info format (emacs24-common-non-dfsg in Debian)</li>
                                </ul>
-                       </p>
+
                </div>
 
                <div class="session">