corrected typo (#1309)

docs/intro/overview.rst

@@ -42,7 +42,7 @@ rule-based system.
 
 ``Component``\ s can be joined into a ``Model`` or a ``Skill``. ``Model``
 solves a larger NLP task compared to ``Component``. However, in terms of
-implementation ``Models``\ s are not different from ``Component``\ s. The
+implementation ``Model``\ s are not different from ``Component``\ s. The
 difference of a ``Skill`` from a ``Model`` is that its input and output should
 both be strings. Therefore, ``Skill``\ s are usually associated with
 dialogue tasks.