fix typo (#38)

* fix links

* fix typo

Author: keithasaurus

docs/index.rst

@@ -10,7 +10,7 @@ Koda Validate
    :noindex:
 
 Build validation logic :ref:`automatically<index:Derived Validators>`, explicitly, or :ref:`write your own<how_to/extension:Extension>`. Combine
-validators for arbitrarily complex validation logic. Koda Validator can be used in normal control flow
+validators for arbitrarily complex validation logic. Koda Validate can be used in normal control flow
 (:ref:`compatible with asyncio<how_to/async:Async>`) or as a :ref:`runtime type checker<how_to/runtime_type_checking:Runtime Type Checking>`.