[WFLY-11689] Bump docs version from 15 to 16.
[WFLY-11689] Bump docs version from 15 to 16.

jstourac/wildfly,pferraro/wildfly,jstourac/wildfly,iweiss/wildfly,iweiss/wildfly,wildfly/wildfly,xasx/wildfly,jstourac/wildfly,rhusar/wildfly,rhusar/wildfly,jstourac/wildfly,pferraro/wildfly,wildfly/wildfly,wildfly/wildfly,xasx/wildfly,xasx/wildfly,iweiss/wildfly,pferraro/wildfly,tadamski/wildfly,tadamski/wildfly,iweiss/wildfly,rhusar/wildfly,tadamski/wildfly,pferraro/wildfly,wildfly/wildfly,rhusar/wildfly