Hello,
UPDATE: phpdocx 10 added support to apply custom list styles with ol and ul tags.
To apply custom list styles, you need to use ul tags, not ol:
<ul class="list-style-number-3">
<li style="text-align: justify;">Ñтõÿõýь ÑþþтòõтÑÑ‚Ã²Ã¸Ñ ÃžÃ±ÑŠÃµÃºÑ‚Ã° Ã¡Ã¾Ã³Ã»Ã°ÑˆÃµÃ½Ã¸Ñ Ã¢Ñ€ÃµÃ±Ã¾Ã²Ã°Ã½Ã¸Ñü ú ÿõрõôðчõ;</li>
<li style="text-align: justify;">ýõþñхþôøüыõ ôõùÑÑ‚Ã²Ã¸Ñ Ã´ÃȄ Ã¿Ñ€Ã¸Ã²ÃµÃ´ÃµÃ½Ã¸Ñ ÃžÃ±ÑŠÃµÃºÑ‚Ã° Ã¡Ã¾Ã³Ã»Ã°ÑˆÃµÃ½Ã¸Ñ Ã² ÑþþтòõтÑтòøõ Ñ Ã¢Ñ€ÃµÃ±Ã¾Ã²Ã°Ã½Ã¸Ñüø ú ÿõрõôðчõ (õÑûø Þñъõúт Ã¡Ã¾Ã³Ã»Ã°ÑˆÃµÃ½Ã¸Ñ Ã½Ãµ ÑþþтòõтÑтòуõт тðúøü трõñþòðýøÑü), Ñрþúø øх þÑущõÑтòûõýøÑ, ÿþрÑôþú фøýðýÑøрþòðýøÑ, þтòõтÑтòõýýых ÿрõôÑтðòøтõûõù áтþрþý;</li>
<li style="text-align: justify;">ôðту фðúтøчõÑúþù ÿõрõôðчø (òþ÷òрðтð) Þñъõúтð Ã¡Ã¾Ã³Ã»Ã°ÑˆÃµÃ½Ã¸Ñ Ãšþýцõôõýту;</li>
<li style="text-align: justify;">ÿþрÑôþú ø уÑÃ»Ã¾Ã²Ã¸Ñ Ã¿ÃµÑ€ÃµÃ´Ã°Ñ‡Ã¸ (òþ÷òрðтð) Þñъõúтð áþóûðшõýøÑ;</li>
<li style="text-align: justify;">ÑþÑтðò ôþúуüõýтþò, ÿþôûõöðщøх ÿõрõôðчõ Úþýцõôõýту ò ÑþþтòõтÑтòøø Ñ Ã¿ÑƒÃ½ÃºÑ‚Ã¾Ã¼ <a href="#heading-999">29.1</a> áþóûðшõýøÑ;</li>
<li style="text-align: justify;">ÿþрÑôþú ôõùÑтòøù áтþрþý ò цõûÑÑ… óþÑуôðрÑтòõýýþù рõóøÑтрðцøø Ã¿Ñ€ÃµÃºÑ€Ã°Ñ‰ÃµÃ½Ã¸Ñ Ã¿Ñ€Ã°Ã² ÚþýцÃ楥øþýõрð ò þтýþшõýøø Þñъõúтð Ã¡Ã¾Ã³Ã»Ã°ÑˆÃµÃ½Ã¸Ñ ÃºÃ°Ãº Ã¾Ã±Ñ€ÃµÃ¼ÃµÃ½ÃµÃ½Ã¸Ñ Ã¿Ñ€Ã°Ã²Ã° ÑþñÑтòõýýþÑтø Úþýцõôõýтð.</li>
</ul>
Regards.