MAINT: core: Fix a very long line in generated ufunc docstrings.

Put the $BROADCASTABLE_2 text on its own line, and add a line break
in the text.  This changes a typical ufunc docstring from this (note
the very long line beginning 'The arrays to be subtracted...'):

```
Parameters
----------
x1, x2 : array_like
    The arrays to be subtracted from each other. If ``x1.shape != x2.shape``, they must be broadcastable to a common shape (which becomes the shape of the output).
out : ndarray, None, or tuple of ndarray and None, optional
    A location into which the result is stored. If provided, it must have
```

to this:

```
Parameters
----------
x1, x2 : array_like
    The arrays to be subtracted from each other.
    If ``x1.shape != x2.shape``, they must be broadcastable to a common
    shape (which becomes the shape of the output).
out : ndarray, None, or tuple of ndarray and None, optional
    A location into which the result is stored. If provided, it must have
```

0 files changed, 0 insertions, 0 deletions