notify: some work on fixing notify supression

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
README.md, README-server.md: Fix broken markup

Fix all instances of triple-single-quote and double-single-quote
markup; this doesn't actually turn into any kind of markup.
Instead use backticks, which come out as <code>-style fixed
width font formatting (which makes sense for the command
line options and filenames that the previous quotes were
trying to mark up). Also add backticks around a few "ADDRESS"
tokens that inconsistently didn't have them.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
README.md: Expand fetch docs and mention ability to set default URL

Expand the documentation of 'fetch' a little; in particular, describe
how to set the default URL in the .patchesrc file.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>