update

0205-isomorphic-strings/README.md

@@ -2,7 +2,7 @@
 
 <p>Two strings <code>s</code> and <code>t</code> are isomorphic if the characters in <code>s</code> can be replaced to get <code>t</code>.</p>
 
-<p>All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, but a character may map to itself.</p>
+<p>All the occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, but a character may map to itself.</p>
 
 <p>&nbsp;</p>
 <p><strong class="example">Example 1:</strong></p>
@@ -23,4 +23,4 @@
 	<li><code>t.length == s.length</code></li>
 	<li><code>s</code> and <code>t</code> consist of any valid ascii character.</li>
 </ul>
-</div>
+</div>