Fix some sphinx doc errors.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@352887 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ClangTools.rst

@@ -10,8 +10,8 @@ refactoring, etc.
 
 Only a couple of the most basic and fundamental tools are kept in the
 primary Clang tree. The rest of the tools are kept in a separate
-directory tree, ``clang-tools-extra
-<https://github.com/llvm/llvm-project/tree/master/clang-tools-extra>``_.
+directory tree, `clang-tools-extra
+<https://github.com/llvm/llvm-project/tree/master/clang-tools-extra>`_.
 
 This document describes a high-level overview of the organization of
 Clang Tools within the project as well as giving an introduction to some