Fix typo.

llvm-svn: 244490
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index 8cc0f98..ca2e177 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -415,7 +415,7 @@
 specification.
 
 ============================== ======= ======= ======= =======
-         Opeator               OpenCL  AltiVec   GCC    NEON
+         Operator              OpenCL  AltiVec   GCC    NEON
 ============================== ======= ======= ======= =======
 []                               yes     yes     yes     --
 unary operators +, --            yes     yes     yes     --