LanguageExtensions: Manually word wrap a line to reduce horizontal scrolling.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153048 91177308-0d34-0410-b5e6-96231b3b80d8

docs/LanguageExtensions.html

@@ -590,7 +590,8 @@ and <tt>unavailable</tt> attributes.  For example:</p>
 will be incorporated into the appropriate diagnostic:</p>
 
 <blockquote>
-<pre>harmless.c:4:3: warning: 'explode' is deprecated: extremely unsafe, use 'combust' instead!!! [-Wdeprecated-declarations]
+<pre>harmless.c:4:3: warning: 'explode' is deprecated: extremely unsafe, use 'combust' instead!!!
+      [-Wdeprecated-declarations]
   explode();
   ^</pre>
 </blockquote>