Fix typo in template diffing docs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@188120 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst
index bdcd471..d2ded6b 100644
--- a/docs/UsersManual.rst
+++ b/docs/UsersManual.rst
@@ -422,7 +422,7 @@
            map<
              [...],
              map<
-               [float != float],
+               [float != double],
                [...]>>>
 
 .. _cl_diag_warning_groups: