Fix typos and one extra import.
--HG--
branch : trunk
diff --git a/jinja2/environment.py b/jinja2/environment.py
index 75f58d6..a08aad2 100644
--- a/jinja2/environment.py
+++ b/jinja2/environment.py
@@ -288,8 +288,8 @@
loader=missing, cache_size=missing, auto_reload=missing,
bytecode_cache=missing):
"""Create a new overlay environment that shares all the data with the
- current environment except of cache and the overriden attributes.
- Extensions cannot be removed for a overlayed environment. A overlayed
+ current environment except of cache and the overridden attributes.
+ Extensions cannot be removed for an overlayed environment. An overlayed
environment automatically gets all the extensions of the environment it
is linked to plus optional extra extensions.