Small typo fix in documentation.
Fixes #6.
diff --git a/docs/index.rst b/docs/index.rst
index 52f88e5..e4935de 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -45,7 +45,7 @@
The path to the store can also be specified with the
``OPENID_FS_STORE_PATH`` configuration variable.
-Alternatively the object can be instanciated without the application in
+Alternatively the object can be instantiated without the application in
which case it can later be registered for an application with the
:meth:`~OpenID.init_app` method.
