And as a result I have:
some text another text
May be I do something wrong? Or it just doesn't work in Jira?
It seems to be working for me, when I tested in my jira.I think you have disabled the wiki style renderer or in other words, your text field is working with default text renderer and it does not use wiki style renderer, to enable it, Goto Administration->Issues->Fields..->Field Configurations Tab->select the field configuration->check the field's renderer.Change it if it is default text renderer.
Hope this Helps.
While I didn't complete understand what you meant by 'system comments', in JIRA there is nothing special to add a new line in the wiki markup. Just press enter while typing and that's it.
It looks too simple an answer for me, if I have misunderstood your question, please let me know.
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