BUG: DOCS incorrect source link on docs

[swallan]

Describe your issue.

When I click source on mannwhitenyu,

it takes me here,

scipy/scipy/stats/_axis_nan_policy.py

Line 181 in b5d8bab

def is_too_small(samples):

to the NaN policy functions.

when I think it should probably be here:

scipy/scipy/stats/_mannwhitneyu.py

Line 182 in b5d8bab

def mannwhitneyu(x, y, use_continuity=True, alternative="two-sided",

The same thing happens with Wilcoxon, but I haven't look extensively for others with the same issue

Reproducing Code Example

N/a

Error message

N/a

SciPy/NumPy/Python version information

1.8 docs online

[mdhaber]

Yes, this is something I've noticed - Sphinx doesn't know how to find the original function to which a decorator was applied. I've meant to figure out some way of telling it where to go manually. @tirthasheshpatel any thoughts?

There are a few other issues I noticed with the [source] link:

• It's missing for all the scipy.stats.sampling classes.
• It doesn't know what lines distributions classes are defined on.