Documentation should warn that mixing positional and keyword arguments in url tag does not work

[eibaan]

#8764 makes it clear that the url tag cannot mix args and kwargs however the documentation isn't clear about this and actually, the ​example shown is one that mixes positional and keyword arguments.

I'd suggest to rephrase this like so:

{% url path.to.some_view arg1,arg2 %}
or
{% url path.to.some_view name1=value1,name2=value2 %}

The first argument is a path to a view function in the format
package.package.module.function. Additional arguments are optional 
and should be comma-separated values that will be used as either 
positional or  keyword arguments in the URL. Do not mix positional
and keyword arguments in on statement. All arguments required by 
the URLconf should be present.

[Jacob]

This is a duplicate of #8764.