Fix some wrong spelling in the README.md

Signed-off-by: nadongjun <aa9814526@gmail.com>

orderer/README.md

@@ -46,4 +46,3 @@ Profiling the ordering service is possible through a standard HTTP interface doc
 Note that failures of the profiling service, either at startup or anytime during the run, will cause the overall orderer service to fail. Therefore it is currently not recommended to enable profiling in production settings.
 
 <a rel="license" href="http://creativecommons.org/licenses/by/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/4.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution 4.0 International License</a>.
-s