DOC:Typo in doc

Fixes #3553

doc/faq.rst

@@ -47,7 +47,7 @@ Not in the forseeable future.
 scikit-learn tries to provide a unified API for the basic tasks in machine
 learning, with pipelines and meta-algorithms like grid search to tie
 everything together. The required concepts, APIs, algorithms and
-expertise required for stuctured learning are different from what
+expertise required for structured learning are different from what
 scikit-learn has to offer. If we started doing arbitrary structured
 learning, we'd need to redesign the whole package and the project
 would likely collapse under its own weight.