Extra guidelines for writing documentation for the web.

[SVN r53551]

writingdoc/structure.html

@@ -116,6 +116,14 @@
   by the standard. Boost libraries should also provided additional
   documentation, such as introductory, tutorial, example, and rationale
   material.</p>
+  
+  <p>Since the documentation is also intended to act as a web reference, it's a
+  good idea to add some extra information to individual pages, especially
+  detailed reference pages. Full C++ identifiers and required headers are
+  especially useful and often overlooked. Remember that individual pages might
+  be accessed directly from a search engine or link, so readers won't have seen
+  information from previous pages. In reference pages, it can be helpful to link
+  to relevant tutorial information.</p>
 
   <h2><a name="standards-conforming" id="standards-conforming">Standards
   Conforming</a> Documentation</h2>