What is the spec for "See Also" in docstrings?

scipy/scipy#8702 shows an example where a line with multiple function names prior to the colon (:) loses all text after the colon.

    See Also
    --------
    scipy.stats.kstwobign : Provides the functionality as a continuous distribution
    smirnov, smirnovi, smirnovc, smirnovci, smirnovp : Functions for the one-sided distribution

generates a block looking like

    See Also:
    scipy.stats.kstwobign  Provides the functionality as a continuous distribution
    smirnov, smirnovi, smirnovc, smirnovci, smirnovp

The text "Functions for the one-sided distribution" has completely disappeared from the output.
Also the last line, while inside the HTML <div> ... </div> block, is in a separate paragraph.

Q. What is the spec for the See Also block?

I found an implementation inside NumpyDocString._parse_see_also() in numpydoc/docscrape.py. It appears to accept:

1. <FUNCNAME>
2. <FUNCNAME> <SPACE>* : <DESCRIPTION>
3. <FUNCNAME> , <FUNCNAME>
   but not
4. <FUNCNAME> , <FUNCNAME> SPACE* : <DESCRIPTION>

Is the dropping of the DESCRIPTION in the last one intentional, or an unintended side-effect of the particular regexes used?

Start with NumpyDocString._parse_see_also() in numpydoc/docscrape.py and compare its handling of the four See Also forms shown in the issue. Determine the intended spec for grouped names with a description, then establish the expected output and verify that descriptions and paragraph structure are handled consistently.