- describe limitation of weight parameter - describe a potential workaround against those limitations

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#### Description <!-- Describe your changes in detail --> We had problems understanding the weight parameter of the dispatcher module and wrote a little workaround against the problems we have found. This workaround in the configuration file improves behavior for setups with many dispatcher targets at the cost of more CPU load. You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/4158

-- Commit Summary --

* dispatcher: weight documentation and workaround for limitations

-- File Changes --

M src/modules/dispatcher/doc/dispatcher_admin.xml (28) A src/modules/dispatcher/doc/weights.cfg (49)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/4158.patch https://github.com/kamailio/kamailio/pull/4158.diff