Be less bold.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@211397 91177308-0d34-0410-b5e6-96231b3b80d8

www/cxx_status.html

@@ -505,7 +505,7 @@ table describes the Clang version in which each feature became available.</p>
 
 <h2 id="cxx17">C++1z implementation status</h2>
 
-<p>Clang has <b>highly experimental<b> support for some proposed features of
+<p>Clang has <b>highly experimental</b> support for some proposed features of
 the C++ standard following C++1y,
 provisionally named C++1z.  The following table describes which C++1z features
 have been implemented in Clang and in which Clang version they became