add section to ToC

llvm-svn: 135811

llvm/docs/ProgrammersManual.html

@@ -69,9 +69,12 @@ option</a></li>
       <li><a href="#dss_other">Other Sequential Container Options</a></li>
     </ul></li>
     <li><a href="#ds_string">String-like containers</a>
-      <!--<ul>
-       todo
-       </ul>--></li>
+    <ul>
+      <li><a href="#dss_stringref">llvm/ADT/StringRef.h</a></li>
+      <li><a href="#dss_twine">llvm/ADT/Twine.h</a></li>
+      <li><a href="#dss_smallstring">llvm/ADT/SmallString.h</a></li>
+      <li><a href="#dss_stdstring">std::string</a></li>
+    </ul></li>
     <li><a href="#ds_set">Set-Like Containers (std::set, SmallSet, SetVector, etc)</a>
     <ul>
       <li><a href="#dss_sortedvectorset">A sorted 'vector'</a></li>