Update CSS tests to revision 31d63cc79bd4c929ed582229e936d7b389f3e6ab

tests/wpt/css-tests/tools/wptserve/docs/server.rst

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+Server
+======
+
+Basic server classes and router.
+
+The following example creates a server that serves static files from
+the `files` subdirectory of the current directory and causes it to
+run on port 8080 until it is killed::
+
+  from wptserve import server, handlers
+
+  httpd = server.WebTestHttpd(port=8080, doc_root="./files/",
+                              routes=[("GET", "*", handlers.file_handler)])
+  httpd.start(block=True)
+
+:mod:`Interface <wptserve>`
+---------------------------
+
+.. automodule:: wptserve.server
+   :members: