Fix typo

Ahmed TAILOULOUTE · Ahmed TAILOULOUTE · commit b29d9dbd992c · 2017-03-02T00:23:19.000Z
diff --git a/components/cache/cache_invalidation.rst b/components/cache/cache_invalidation.rst
@@ -7,7 +7,7 @@ Cache Invalidation
 
 Cache invalidation is the process of removing all cached items related to a
 change in the state of your model. The most basic kind of invalidation is direct
-items deletion. But when the state of a primary resource has spread accross
+items deletion. But when the state of a primary resource has spread across
 several cached items, keeping them in sync can be difficult.
 
 The Symfony Cache component provides two mechanisms to help solving this problem:
