(TK-343) Reduce some `normalized-request-uri` README.md redundancy
(TK-343) Reduce some `normalized-request-uri` README.md redundancy

This commit cuts down on some of the redundant text about the
`:normalize-request-uri` option in the README.md file.

puppetlabs/trapperkeeper-webserver-jetty9,rlinehan/trapperkeeper-webserver-jetty9,puppetlabs/trapperkeeper-webserver-jetty9,rlinehan/trapperkeeper-webserver-jetty9,camlow325/trapperkeeper-webserver-jetty9,camlow325/trapperkeeper-webserver-jetty9