Update section header to be more clear

Author: Erich-McMillan

README.rst

@@ -261,7 +261,7 @@ an output file::
 
 __ http://robotframework.org/robotframework/#built-in-tools
 
-Serving Multiple Libraries
+Serving Multiple Libraries With One Server
 -------
 
 In many cases it maybe be desirable to serve multiple libraries from a single