[docs] Fix rst title in clang langext docs. NFCI

Fix an odd line in LanguageExtensions.rst which
rendered incorrectly due to an underscore being
mixed in with dashes.

llvm-svn: 357793

diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index d79d412..0299dde 100644 (file)
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -1791,7 +1791,7 @@ the arguments. Both arguments and the result have the bitwidth specified
 by the name of the builtin.
 
 ``__builtin_rotateright``
-_------------------------
+-------------------------
 
 * ``__builtin_rotateright8``
 * ``__builtin_rotateright16``