This commit fixes two typos, and updates the rest of the registry example.
* doc/book/book/ch06.xml
Update Win32 Registry example:
Registry Sections:
(DEFAULT): changed to global
(groups, tunnel, auto-props): Added
Registry Keys:
(http-proxy-timeout): Changed to http-timeout.
(http-proxy-exceptions, neon-debug-mask, ssl-authority-files,
ssl-trust-default-ca, ssl-client-cert-file,
ssl-client-cert-password): Added to the "global" section.
(diff-cmd, diff3-cmd, diff3-has-program-arg): Added to the
"helpers" section.
(log-encoding, use-commit-times, template-root,
enable-auto-props): Added to the "miscellany" section.
