Documentation: nuxeo.url property more detailed

1) One link into nuxeo-distribution/nuxeo-server-tomcat/src/main/resources/tomcat/bin/nuxeo.conf is broken (404 error).
We can remove the two links and add the good one: https://doc.nuxeo.com/nxdoc/configuration-parameters-index-nuxeoconf/

2) About the nuxeo.url property from this config file: it is not what I expected when I modified nuxeo.server.http.port to change the dafault port. My process:

1. download the latest version of Nuxeo (.zip)
2. decompress it and go to the resulting folder
3. add this line to bin/nuxeo.conf:

   nuxeo.server.http.port=9999

4. start the server:

   ./bin/nuxeoctl start|wizard

5. the server starts but the last printed line is wrong:

   Go to http://localhost:8080/nuxeo

As I did not change the nuxeo.url property (commented by default), the URL should be http://localhost:9999/nuxeo.

After several exchanges with others developers, I got that this property is only used for emails sent out and HTML -> PDF conversion; and it is the application URL of course.
We can add a more specific sentence to the documentation (doc.nuxeo.com-content repos).