Typos

Unrelated to issue #300, but found them while working on it.

index.html

@@ -5315,7 +5315,7 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
     be set to <code>null</code> in an intervening context, such as a <a>scoped context</a> as follows:</p>
 
   <pre class="example nohighlight" data-transform="updateExample"
-       title="Clearing default language">
+       title="Clearing default base direction">
   <!--
   {
     "@context": {
@@ -9055,7 +9055,7 @@ <h3>Using the Document Base for the Default Vocabulary</h3>
     the graph itself is expressed via the <code>generatedAt</code> property,
     which specifies when the graph was generated.</p>
 
-  <p>When a JSON-LD document's top-level structure is an
+  <p>When a JSON-LD document's top-level structure is a
     <a>map</a> that contains no other
     keys than <code>@graph</code> and
     optionally <code>@context</code> (properties that are not mapped to an