fix typo

Author: nicoder

property/align-self/index.html

@@ -132,7 +132,7 @@ <h2 class="property-name">
         </p>
         <div class="example-description">
           <p>If the container has <code>align-items: center</code> and the <strong>target</strong> has <code>align-self: baseline</code>, only the target will be at the baseline of the cross axis.</p>
-<p>By default, this means it will be aligned along the basline of the text.</p>
+<p>By default, this means it will be aligned along the baseline of the text.</p>
 
         </div>
       </header>