Revert "studies.rst: Add Bonacchi et al. (NeuroImage: Clinical, 2022)"

Reverts commit fd6d38f.

Justification: 

> I am a bit reluctant to add reviews here, especially when not labeled as 'review', as it gives a misleading view that SCT was used in all the studies listed there.
> 
> I think we have enough citations from primary studies to let go the review papers

documentation/source/overview/studies.rst

@@ -8,7 +8,6 @@ The following studies have used SCT:
 2022
 ----
 
--  Bonacchi *et al.* `Role of artificial intelligence in MS clinical practice <https://www.sciencedirect.com/science/article/pii/S2213158222001309>`_ **NeuroImage: Clinical** 2022
 -  Jayasekera *et al.* `Analysis of combined clinical and diffusion basis spectrum imaging metrics to predict the outcome of chronic cervical spondylotic myelopathy following cervical decompression surgery <https://thejns.org/spine/view/journals/j-neurosurg-spine/aop/article-10.3171-2022.3.SPINE2294/article-10.3171-2022.3.SPINE2294.xml>`_ **Journal of Neurosurgery** 2022
 -  Tinnermann *et al.* `Opioid analgesia alters corticospinal coupling along the descending pain system in healthy participants <https://elifesciences.org/articles/74293>`_ **eLife** 2022
 -  Kim *et al.* `Confounder-adjusted MRI-based predictors of multiple sclerosis disability <https://www.medrxiv.org/content/10.1101/2022.04.18.22273974v1>`_. (preprint) 2022