Fix typo.

llvm-svn: 193281
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index afd96ca..ca02b7e 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -1196,7 +1196,7 @@
 This attribute can only be applied the method declarations within a class, and not a protocol.
 
 Note that on both OS X and iOS that the Foundation framework provides a
-convenience macro ``NS_REQUIRES_SUPER`` that provides syntantic sugar for this
+convenience macro ``NS_REQUIRES_SUPER`` that provides syntactic sugar for this
 attribute:
 
 .. code-block:: objc