Regression in smart quotes

[serhiy-storchaka]

Describe the bug

Comparing the output of Shinx 3.2.1 and 3.5.4 I have found differences in smart quotes. For example:

 <p>Add a Shell sidebar.  Move the primary prompt (‘&gt;&gt;&gt;’) to the sidebar.
-Add secondary prompts (’…’) to the sidebar.  Left click and optional
+Add secondary prompts (‘…’) to the sidebar.  Left click and optional
 drag selects one or more lines of text, as with the editor

 <li><p><a class="reference external" href="https://bugs.python.org/issue32775">bpo-32775</a>: <a class="reference internal" href="../library/fnmatch.html#fnmatch.translate" title="fnmatch.translate"><code class="xref py py-func docutils literal notranslate"><span class="pre">fnmatch.translate()</span></code></a> no longer produces patterns which
-contain set operations. Sets starting with ‘[’ or containing ‘–’, ‘&amp;&amp;’,
+contain set operations. Sets starting with ‘[‘ or containing ‘–’, ‘&amp;&amp;’,
 ‘~~’ or ‘||’ will be interpreted differently in regular expressions in

 <li><p><a class="reference external" href="https://bugs.python.org/issue21933">bpo-21933</a>: Turtledemo users can change the code font size with a menu
-selection or control(command) ‘-’ or ‘+’ or control-mousewheel. Original
+selection or control(command) ‘-‘ or ‘+’ or control-mousewheel. Original
 patch by Lita Cho.</p></li>

Note that the closing quote is a backquote.

How to Reproduce

Build CPython docs with Sphinx 3.2.1 (default) an Sphinx 3.5.4 and compare results.

Expected behavior

Backquotes should be used as opening quotes, normal quotes should be used as closing quotes.

Your project

https://github.com/python/cpython

Screenshots

No response

OS

Linux 5.4.0

Python version

3.8

Sphinx version

3.5.4

Sphinx extensions

No response

Extra tools

No response

Additional context

No response