Fix the __has_attribute example; we don't have an override attribute anymore.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@124106 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html
index ef6b0da..ecd7169 100644
--- a/docs/LanguageExtensions.html
+++ b/docs/LanguageExtensions.html
@@ -151,10 +151,10 @@
 #endif
 
 ...
-#if __has_attribute(override)
-#define OVERRIDE __attribute__((override))
+#if __has_attribute(always_inline)
+#define ALWAYS_INLINE __attribute__((always_inline))
 #else
-#define OVERRIDE
+#define ALWAYS_INLINE
 #endif
 ...
 </pre>