attempt to fix a buildbot failure, apparently apache fails to build.

llvm-svn: 120688
diff --git a/clang/lib/Basic/FileManager.cpp b/clang/lib/Basic/FileManager.cpp
index f126760a..0e47e5e 100644
--- a/clang/lib/Basic/FileManager.cpp
+++ b/clang/lib/Basic/FileManager.cpp
@@ -434,7 +434,7 @@
 }
 
 /// getStatValue - Get the 'stat' information for the specified path, using the
-/// cache to accellerate it if possible.  This returns true if the path does not
+/// cache to accelerate it if possible.  This returns true if the path does not
 /// exist or false if it exists.
 ///
 /// The isForDir member indicates whether this is a directory lookup or not.