Reduce liquid's whitespace for a few pages.

Also fix a couple of typos while at it and change header tags' order.

_includes/callout-danger-async-methods.md

 {% callout danger %}
 #### Asynchronous methods and transitions
 
-All API methods are **asynchronous** and start a **transition**. They returns to the caller as soon as the transition is started but **before it ends**. In addition, a method call on a **transitioning component will be ignored**.
+All API methods are **asynchronous** and start a **transition**. They return to the caller as soon as the transition is started but **before it ends**. In addition, a method call on a **transitioning component will be ignored**.
 
 [See our JavaScript documentation for more information.]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/javascript/)
 {% endcallout %}

_includes/callout-warning-color-assistive-technologies.md

@@ -2,4 +2,4 @@
 #### Conveying meaning to assistive technologies
 
 Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies – such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (e.g. the visible text), or is included through alternative means, such as additional text hidden with the `.sr-only` class.
-{% endcallout %}
\ No newline at end of file
+{% endcallout %}

_includes/docs-sidebar.html

 <form class="bd-search d-flex align-items-center">
   <input type="search" class="form-control" id="search-input" placeholder="Search..." aria-label="Search for..." autocomplete="off">
-  <button class="btn-link bd-search-docs-toggle d-md-none p-0 ml-3" type="button" data-toggle="collapse" data-target="#bd-docs-nav" aria-controls="bd-docs-nav" aria-expanded="false" aria-label="Toggle docs avigation">
+  <button class="btn-link bd-search-docs-toggle d-md-none p-0 ml-3" type="button" data-toggle="collapse" data-target="#bd-docs-nav" aria-controls="bd-docs-nav" aria-expanded="false" aria-label="Toggle docs navigation">
     {% include icons/menu.svg class="" width="30" height="30" %}
   </button>
 </form>
 
 <nav class="collapse bd-links" id="bd-docs-nav">
-  {% assign page_slug = page.url | split: '/' | last %}
-  {% for group in site.data.nav %}
-  {% assign link = group.pages | first %}
-  {% assign link_slug = link.title | slugify %}
-  {% assign group_slug = group.title | slugify %}
-  {% assign active = nil %}
+  {%- assign page_slug = page.url | split: '/' | last -%}
+  {%- for group in site.data.nav -%}
+  {%- assign link = group.pages | first -%}
+  {%- assign link_slug = link.title | slugify -%}
+  {%- assign group_slug = group.title | slugify -%}
+  {%- assign active = nil -%}
 
-  {% if page.group == group_slug %}
-    {% assign active = 'active' %}
-  {% endif %}
+  {%- if page.group == group_slug -%}
+    {%- assign active = 'active' -%}
+  {%- endif -%}
 
-  <div class="bd-toc-item {{ active }}">
+  <div class="bd-toc-item{% unless active == nil %} {{ active }}{% endunless %}">
       <a class="bd-toc-link" href="{{ site.baseurl }}/docs/{{ site.docs_version }}/{{ group_slug }}/{{ link_slug }}{% if link_slug %}/{% endif %}">
         {{ group.title }}
       </a>
 
       <ul class="nav bd-sidenav">
-        {% for doc in group.pages %}
-          {% assign doc_slug = doc.title | slugify %}
-          {% assign active = nil %}
+        {%- for doc in group.pages -%}
+          {%- assign doc_slug = doc.title | slugify -%}
+          {%- assign active = nil -%}
 
-          {% if page.group == group_slug and page_slug == doc_slug %}
-            {% assign active = 'active bd-sidenav-active' %}
-          {% endif %}
+          {%- if page.group == group_slug and page_slug == doc_slug -%}
+            {%- assign active = 'active bd-sidenav-active' -%}
+          {%- endif -%}
 
-          <li class="{{ active }}">
+          <li{% unless active == nil %} class="{{ active }}"{% endunless %}>
             <a href="{{ site.baseurl }}/docs/{{ site.docs_version }}/{{ group_slug }}/{{ doc_slug }}/">
               {{ doc.title }}
             </a>
@@ -50,8 +50,8 @@
             {% endunless %}
             {% endcomment %}
           </li>
-        {% endfor %}
+        {%- endfor -%}
       </ul>
     </div>
-  {% endfor %}
+  {%- endfor -%}
 </nav>

_includes/header.html

@@ -3,15 +3,13 @@
 <meta name="generator" content="Jekyll v{{ jekyll.version }}">
 
 <title>
-  {% if page.title %}
+  {%- if page.title -%}
     {{ page.title }} &middot; {{ site.title }}
-  {% else %}
+  {%- else -%}
     {{ site.title }} &middot; {{ site.description }}
-  {% endif %}
+  {%- endif -%}
 </title>
 
-{% include social.html %}
-
 <!-- Bootstrap core CSS -->
 {% if site.github %}
   <link href="{{ site.baseurl }}/dist/css/bootstrap.min.css" rel="stylesheet">
@@ -25,6 +23,8 @@
 {% endif %}
 <link href="{{ site.baseurl }}/assets/css/docs.min.css" rel="stylesheet">
 
+{% include social.html %}
+
 <script>
   (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
   (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),

_includes/scripts.html

@@ -51,5 +51,5 @@ Holder.addTheme('gray', {
   fg: 'rgba(255,255,255,.75)',
   font: 'Helvetica',
   fontweight: 'normal'
-})
+});
 </script>

_includes/social.html

+<!-- Meta -->
+<meta name="description" content="{{ site.description }}">
+<meta name="author" content="{{ site.authors }}">
+
 <!-- Twitter -->
 <meta name="twitter:site" content="@{{ site.twitter }}">
 <meta name="twitter:creator" content="@{{ site.twitter }}">
@@ -30,7 +34,3 @@
 <meta property="og:image:type" content="image/png">
 <meta property="og:image:width" content="1200">
 <meta property="og:image:height" content="630">
-
-<!-- Meta -->
-<meta name="description" content="{{ site.description }}">
-<meta name="author" content="{{ site.authors }}">