Update detection.html (#17)

Updated Arithmetic section

Author: tigertigerboy07

detection.html

@@ -93,7 +93,8 @@ <h4 class="subheading">Detecting Injections</h4>
     </tr>
     <tr>
       <td>Arithmetic</td>
-      <td>product.asp?id=1/1 -- <i>true</i><br/>product.asp?id=1/0 -- <i>false</i></td>
+      <td>product.asp?id=1/1 -- <i>true</i><br/>product.asp?id=1/0 -- <i>false</i><br>
+      product.asp?id=1/abs(1) -- <i>true</i><br/>product.asp?id=1/abf(1) -- <i>false</i></td>
     </tr>
     <tr>
       <td>Blind based<br/><i>Note: Detecting blind injection may require identification or guess-and-check of the DBMS to find the proper timing function.</i></td>