Document supported schemes.

Doc/lib/liburlparse.tex

@@ -19,9 +19,14 @@ string, and to convert a ``relative URL'' to an absolute URL given a
 
 The module has been designed to match the Internet RFC on Relative
 Uniform Resource Locators (and discovered a bug in an earlier
-draft!).
-
-It defines the following functions:
+draft!). It supports the following URL schemes:
+\code{file}, \code{ftp}, \code{gopher}, \code{hdl}, \code{http}, 
+\code{https}, \code{imap}, \code{mailto}, \code{mms}, \code{news}, 
+\code{nntp}, \code{prospero}, \code{rsync}, \code{rtsp}, \code{rtspu}, 
+\code{sftp}, \code{shttp}, \code{sip}, \code{snews}, \code{svn}, 
+\code{svn+ssh}, \code{telnet}, \code{wais}.
+
+The \module{urlparse} module defines the following functions:
 
 \begin{funcdesc}{urlparse}{urlstring\optional{, default_scheme\optional{, allow_fragments}}}
 Parse a URL into 6 components, returning a 6-tuple: (addressing