fix another typo

Author: nolda

P5/Source/Guidelines/en/AI-AnalyticMechanisms.xml

@@ -1292,7 +1292,7 @@ sake of readability).
       with node index 4, for instance, has <val>2 0</val> as its <att>head</att>
       value and <val>conj root</val> as its <att>deprel</att> value, to be
       interpreted as being both the dependent node of a conjunct relation to the
-      node with index 4 (the verb form <mentioned>buy</mentioned>) as well as
+      node with index 2 (the verb form <mentioned>buy</mentioned>) as well as
       the dependent node of a root relation to the <soCalled>virtual</soCalled>
       root node with index 0. Similarly, concurrent part-of-speech tags are
       given as list values of the <att>pos</att> attribute. The <att>msd</att>