Update headers

Author: josevalim

css/style.css

@@ -173,12 +173,12 @@ h1, h2, h3, h4, h5, h6 {
   color: #24292e;
   line-height: 1.3em;
 }
-h1 { font-size: 2.5384615384615383em; }    /* 33 / 13 = 2.5384615384615383 */
+h1 { font-size: 2.5384615384615383em; }   /* 33 / 13 = 2.5384615384615383 */
 h2 {
-  font-size: 1.6923076923076923em;    /* 22 / 13 = 1.6923076923076923 */
+  font-size: 1.6923076923076923em;        /* 22 / 13 = 1.6923076923076923 */
   margin-top: 1.3333333333333333em;       /* 32 / 24 = 1.3333333333333333 */
 }
-h3 { font-size: 1.538461538461538em; }    /* 20 / 13 = 1.538461538461538 */
+h3 { font-size: 1.461538461538461em; }    /* 19 / 13 = 1.538461538461538 */
 h4 { font-size: 1.384615384615385em; }    /* 18 / 13 = 1.384615384615385 */
 h5 {
   font-size: 1.230769230769231em;    /* 16 / 13 = 1.230769230769231 */

docs.markdown

@@ -19,11 +19,11 @@ and [the Learning page](/learning.html) for books, courses, videos, and more.
     {% continue %}
   {% endif %}
 
-<h4 id="{{ version[1].name }}">
+<h3 id="{{ version[1].name }}">
   {{ version[1].name }}
   {% if version[1].version == stable.version %}<small>(stable)</small>{% endif %}
   <small>(<a href="https://github.com/elixir-lang/elixir/releases/download/v{{ version[1].version }}/Docs.zip">download</a>)</small>
-</h4>
+</h3>
 
 {% if version[1].otp_versions %}
 Supported Erlang/OTP versions: {% for otp in version[1].otp_versions reversed %}{{ otp }}{% if forloop.last %}{% else %}, {% endif %}{% endfor %}.