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docstring = """
**This** is a **bold** text. *This* is an *italic* text.
*`This`* is a *`code`* snippet.

List:
- 123
- 123

Numbered List:
1. Item 1.;
2. Item 2
"""
docstring = docstring.strip()

import re

def format_docstring(docstring):
    docstring = re.sub(r'\*\*(.*?)\*\*', r'<b>\1</b>', docstring) # Заміна '**' на <b> і </b>
    docstring = re.sub(r'\*(.*?)\*', r'<i>\1</i>', docstring) # Заміна '*' на <i> і </i>
    docstring = re.sub(r'`(.*?)`', r'<code>\1</code>', docstring) # Заміна '*`' на <code> і </code>
    # Парсинг списку маркдаун з нумерацією
    docstring = re.sub(r'^\d+\. (.*)$', r'<li>\1</li>', docstring, flags=re.M)
    # Парсинг списку через "-"
    docstring = re.sub(r'\n- (.*)', r'\n<li>\1</li>', docstring)
    # Парсинг відступів
    docstring = docstring.split("\n")
    docstring = "<br>\n".join(docstring)
    docstring = docstring.replace("</li><br>", "</li>")
    return docstring

print(format_docstring(docstring) + "\n")

              
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docstring = """
<b>This</b> is a <b>bold</b> text. <i>This</i> is an <i>italic</i> text.<br>
<i><code>This</code></i> is a <i><code>code</code></i> snippet.<br>
<br>
List:<br>
<ol>
<li>123</li>
<li>123</li>
</ol>
<br>
Numbered List:<br>
<ul>
<ul><li>Item 1.;</li>
<li>Item 2</li>
</ul>
"""

docstring = docstring.replace("<br>", "")
docstring = docstring.replace("<code>", "`").replace("</code>", "`")
docstring = docstring.replace("<b>", "**").replace("</b>", "**")
docstring = docstring.replace("<i>", "*").replace("</i>", "*")
docstring = docstring.replace("<li>", "- ").replace("</li>", "")
docstring = docstring.replace("<ul>\n", "").replace("</ul>\n", "")
docstring = docstring.replace("<ol>\n", "").replace("</ol>\n", "")
docstring = docstring.replace("<ul>", "").replace("</ul>", "")
docstring = docstring.replace("<ol>", "").replace("</ol>", "")

print(docstring)