Fix spelling

Author: niklasl

spec/index.html

@@ -823,7 +823,7 @@ <h3>Literals</h3>
       <li>If the literal is a <a>directional language-tagged string</a>, then the literal value is
         a tuple of its <a>lexical form</a>, its <a>language tag</a>, and its <a>base direction</a>,
         likewise in that order.</li>
-      <li>If the literal's <a>datatype</a> is handled by an RDF implmentation,
+      <li>If the literal's <a>datatype</a> is handled by an RDF implementation,
         <ul>
           <li>if the literal's <a>lexical form</a> is in the <a>lexical space</a>
             of the <a>datatype</a>, then the literal value is the result of applying