docs: Change title.

The core of this page is a set of pros/cons for the different ways to
use clang as a library. The title should reflect that the page helps you
choose between alternatives.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171377 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/Tooling.rst b/docs/Tooling.rst
index 78b92ef..1e84817 100644
--- a/docs/Tooling.rst
+++ b/docs/Tooling.rst
@@ -1,6 +1,6 @@
-===================
-Writing Clang Tools
-===================
+=================================================
+Choosing the Right Interface for Your Application
+=================================================
 
 Clang provides infrastructure to write tools that need syntactic and semantic
 information about a program.  This document will give a short introduction of