Fix typo.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90390 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html
index edc7037..414d9c8 100644
--- a/docs/LanguageExtensions.html
+++ b/docs/LanguageExtensions.html
@@ -212,7 +212,7 @@
 
 <h3 id="cxx_rtti">C++ RTTI</h3>
 
-<p>Use <tt>__has_feature(cxx_rtt)</tt> to determine if C++ RTTI has been enabled. For example,
+<p>Use <tt>__has_feature(cxx_rtti)</tt> to determine if C++ RTTI has been enabled. For example,
 compiling code with <tt>-fno-rtti</tt> disables the use of RTTI.</p>
 
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