Fix typos found by http://github.com/lyda/misspell-check

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157886 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/Tooling.html b/docs/Tooling.html
index 96558d2..4adaf16 100644
--- a/docs/Tooling.html
+++ b/docs/Tooling.html
@@ -33,7 +33,7 @@
 <ul>
   <li>want to interface with clang from other languages than C++</li>
   <li>need a stable interface that takes care to be backwards compatible</li>
-  <li>want powerful high-level abstractions, like iterating throught an AST 
+  <li>want powerful high-level abstractions, like iterating through an AST
 with a cursor, and don't want to learn all the nitty gritty details of Clang's 
 AST.</li>
 </ul>