fix bad xrefs in changelog

[drammock]

two recent PRs introduced crossreferences to methods or attributes that aren't in our public API:

mne-python/doc/changes/dev/13687.bugfix.rst

Line 1 in 16c220d

Fix bug in :func:`~mne.compute_source_morph` where :attr:`mne.SourceMorph.spacing` was set incorrectly when ``src_to`` is provided, by `Famous077`_.

mne-python/doc/changes/dev/13700.bugfix.rst

Line 1 in 16c220d

Fix bug where :func:`mne.channels.DigMontage.set_montage` raised an :exc:`IndexError` on MEG+EEG recordings when EEG reference positions were set to the placeholder value ``[1, 0, 0]`` (i.e., digitization was not performed), by `Famous077`_.

Both had successful CircleCI runs immediately prior to merge, so IDK why these bad crossrefs weren't caught the first time around.

cc @Famous077

[drammock]

in particular:

• SourceMorph.spacing is not a true property or attribute (not defined with def spacing(self), so it isn't crossreference-able
• DigMontage.set_montage() isn't in the public API for some reason. Maybe should be added, but for now let's just get CircleCI passing again on the other PRs as quickly as possible.

[Famous077]

Hi @drammock, thank you for the heads up. I'll fix both PRs right away - remove the invalid cross-references in 13687.bugfix.rst and 13700.bugfix.rst to get CircleCI passing again. Sorry for the trouble

[drammock]

Hi @drammock, thank you for the heads up. I'll fix both PRs right away - remove the invalid cross-references in 13687.bugfix.rst and 13700.bugfix.rst to get CircleCI passing again. Sorry for the trouble

I already merged in fixes