More updates for the URL library manual.
* url.texi (Introduction): Move url-configuration-directory to Customization node. (Parsed URIs): Split into its own node. (URI Encoding): New node. (Defining New URLs): Remove empty chapter. (Retrieving URLs): Add an introduction. Doc fix for url-retrieve. Improve docs for url-queue-*. (Supported URL Types): Copyedits. Delete empty subnodes.
Showing with 316 additions and 223 deletions