Update skip_logic.md

Author: salomegarnier

source/skip_logic.md

@@ -41,6 +41,6 @@ To manually enter skip logic in XLSForm code, follow these steps:
 In XLSForm code, questions are referred to by their **question name** (Data Column Name) using the format `${question_name}`. For example, if Q2 should be asked only if the answer to Q1 is "Yes", the skip logic condition for Q2 would be `${Q1} = ‘yes’`.
 
 <p class="note">
-    For more information on XLSForm code and operators, see <a href="https://xlsform.org/en/#relevant">XLSForm documentation</a>.
+    For more information on XLSForm code and operators, see <a href="https://support.kobotoolbox.org/form_logic_xls.html">Introduction to form logic in XLSForm</a>.
 </p>