Incorrect markdown generated for fenced code blocks containing doctest tests

[chuckwondo]

Describe the bug:

When a fenced code block includes a doctest test (specifically >>> prompts), the generated markdown is incorrect.

Expected behaviour:

Fenced code blocks containing >>> should render just like any other fenced code block.

For example, this docstring:

"""Compute the sum of 2 numbers.

Examples:

```plain
>>> add(1, 2)
3
>>> add(2, 2)
4

"""

should generate the following markdown:

Compute the sum of two numbers.

Examples:

>>> add(1, 2)
3
>>> add(2, 2)
4

Unfortunately, it produces the following instead:

Compute the sum of two numbers.

Examples:

``` add(1, 2)``` 3 ``` add(2, 2)```
4

And the resulting HTML does not render as expected.

**Steps to reproduce the issue:**

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2. Click on '....'
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See example docstring above.

**Technical details:**

- Host Machine OS (Windows/Linux/Mac): Mac
- Browser (Chrome/Firefox/Safari): Any

**Possible Fix:**

<!--- Not obligatory, but suggest a fix or reason for the bug -->
I have not looked at the lazydocs code, so I don't know, but happy to dig in, if it would help.

**Additional context:**

<!-- Add any other context about the problem here. -->
None

[chuckwondo]

Hmmm, I just discovered this: https://github.com/ml-tooling/lazydocs/blob/v0.4.8/src/lazydocs/generation.py#L366-L368

At first glance, this appears to be incorrect, but I'll investigate further.

[github-actions[bot]]

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