Title case for subsections in 3.x

Author: afs

spec/index.html

@@ -1002,7 +1002,7 @@ <h3>Literals</h3>
     </ul>
 
     <section>
-      <h4>Representation of literals</h4>
+      <h4>Representation of Literals</h4>
 
       <p>Some concrete syntaxes MAY support
         <dfn data-lt="simple literal" class="export">simple literals</dfn> consisting of only a
@@ -1043,7 +1043,7 @@ <h4>Representation of literals</h4>
     </section>
 
     <section>
-      <h4>Literal value</h4>
+      <h4>Literal Value</h4>
 
         <p>The <dfn class="export">literal value</dfn> associated with a <a>literal</a> is defined as follows.</p>
 
@@ -1091,7 +1091,7 @@ <h4>Literal value</h4>
     </section>
 
     <section id="section-text-direction" class="informative">
-      <h4>Initial text direction</h4>
+      <h4>Initial Text Direction</h4>
 
       <p>The <a>base direction</a> of a <a>directional language-tagged string</a>
         provides a means of establishing the initial direction of text,