Fix typo (fix #17946)

DelazJ · nyalldawson · commit 76e778d04dfb · 2018-01-29T12:00:52.000+11:00
diff --git a/scripts/spell_check/spelling.dat b/scripts/spell_check/spelling.dat
@@ -873,6 +873,7 @@ avaluates:evaluates
 avaluating:evaluating
 avaoided:avoided
 avation:aviation
+avdanced:advanced
 avengence:a vengeance
 averageed:averaged
 aviable:available
