Update README.md

Cleaning up formatting.
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 For a general introduction to XOS and how it is used in CORD, see
 http://guide.xosproject.org. The "Developer Guide" at that URL is
-especially helpful, although it is sync'ed with the previous
-release (Burwell), which lags what's in master.
+especially helpful, although it isn't perfectly sync'ed with master. 
 Additional design notes, presentations, and other collateral are 
 also available at http://xosproject.org and http://cord.onosproject.org.
 
 One quick way to get started is to build and run the containers in
-*containers* (see the README in that directory for more information).
+`containers/` (see the README in that directory for more information).
 
 Another quick way to get started is to look at the collection of
-canned configurations in *xos/configurations*. The *cord* 
+canned configurations in `xos/configurations/`. The `cord` 
 configuration in that directory corresponds to our current 
-CORD development environment, and the README you'll find there
+CORD development environment, and the `README.md` you'll find there
 will help you get started.