[FIX] make MEG section headings and ToC consistent to the EEG and iEEG specs

[robertoostenveld]

The headings for photo, headshape and empty-room were one level lower (i.e. ### rather than ##) than they should be.

This should make the following headings and table of contents more similar

• https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/02-magnetoencephalography.html
• https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/03-electroencephalography.html
• https://bids-specification.readthedocs.io/en/stable/04-modality-specific-files/04-intracranial-electroencephalography.html

[sappelhoff]

Thanks Robert - two comments from my side:

1. see Chris' comment: https://github.com/bids-standard/bids-specification/pull/181/files#r266490960
2. Wouldn't it be better to have these changes as part of your PR [FIX] make section headings and ToC consistent between meg and eeg specs #180 ?

[robertoostenveld]

Thanks Robert - two comments from my side:

1. see Chris' comment: https://github.com/bids-standard/bids-specification/pull/181/files#r266490960

Agreed. I propose to change it to <ext>. Traveling right now, so will have to wait a bit (or you can do it).

2. Wouldn't it be better to have these changes as part of your PR [FIX] make section headings and ToC consistent between meg and eeg specs #180 ?

I wanted to keep ieeg and meg changes separate (since different people might want to review the respective changes.

[sappelhoff]

Agreed. I propose to change it to . Traveling right now, so will have to wait a bit (or you can do it).

+1, however I don't have write access to your repo

but it's okay to wait with it for a few days