DOC typo in ExtraTrees

Author: larsmans

doc/modules/computational_performance.rst

@@ -169,7 +169,7 @@ support vectors.
 .. centered:: |nusvr_model_complexity|
 
 For :mod:`sklearn.ensemble` of trees (e.g. RandomForest, GBT,
-ExternalTrees etc) the number of trees and their depth play the most
+ExtraTrees etc) the number of trees and their depth play the most
 important role. Latency and throughput should scale linearly with the number
 of trees. In this case we used directly the ``n_estimators`` parameter of
 :class:`sklearn.ensemble.gradient_boosting.GradientBoostingRegressor`.