Fix typo: [[CALL] => [[CALL]]

Author: azu

es7/2016-01/2016-01-28.md

@@ -339,7 +339,7 @@ CP: yup
 
 EF: we have one potential problem to discuss,
 
-EF: slide edition 1 [[CALL] Behavior (Considered a Spec bug)
+EF: slide edition 1 [[CALL]] Behavior (Considered a Spec bug)
 
 AWB: thats basically, at the time the spec was drafted that was how the current thinking of internal slots to happen. This allowed internal state to be dynamically added to instances, that was decided inappropriate, and ultiamtely abondoned.