added docs

docs/isValidIsbn13.html

@@ -116,7 +116,9 @@
   
 </div>
 <div>
-  <div class="doc_block_items" id="function_isValidIsbn13_0_div"><div>
+  <div class="doc_block_items" id="function_isValidIsbn13_0_div"><div class="markdown_summary"><p>Validate is the input string is a valid 13 digits ISBN as defined
+in <a href="https://en.wikipedia.org/wiki/ISBN">https://en.wikipedia.org/wiki/ISBN</a></p>
+</div><div>
   Parameters
   <div class="section">
     <div class="doc_item" id="function_isValidIsbn13_0_parameters_str">
@@ -139,7 +141,8 @@
     </code>
     </span>
   </div>
-  
+  <div class="markdown"><p>a text we want to test if it is a real isbn</p>
+</div>
 </div>
   </div>
 </div><div>