[FIX] Fix typos and formatting

[alexandreroutier]

Hello,

I found very small typos/formatting issues. Also, Gray/Grey names were both present. I used US convention to harmonize this.

Best,
Alexandre

[effigies]

Suggestions for diffusion should be submitted to https://github.com/bids-standard/bids-bep016.

Suggestions for common-derivatives should be made against the common-derivatives branch. Or just as review suggestions on #265.

---

Regarding "grey" vs "gray". We don't use either in the current standard, so there's no local precedent.

Gray is consistent with NIfTI-1 and GIFTI. CIFTI-2 uses "gray" in text and "grey" in the constants CIFTI_STRUCTURE_ALL_GREY_MATTER, CIFTI_STRUCTURE_OTHER_GREY_MATTER, so it's not very useful as precedent.

I'm okay with moving fully to gray.

[sappelhoff]

Thanks for the PR. I am also +1 on adopting US spelling convention, because it would be keeping the current convention in the spec.

We use:

• behavior instead of behaviour
• color instead of colour
• analyze instead of analyse

Etc.

so gray isntead of grey makes sense to me.

[sappelhoff]

@effigies could we just change the target of this PR to common-derivatives and merge?

Or should @alexandreroutier first revert his changes to src/05-derivatives/06-diffusion-derivatives.md?

@alexandreroutier if you have some time and are faster than @effigies to respond, you could also adhere to his advice and simply make:

1. a PR to https://github.com/bids-standard/bids-bep016 with your changes in src/05-derivatives/06-diffusion-derivatives.md
2. a set of code suggestions to this PR: [ENH] BEP 003: Common Derivatives #265 (i.e., all other points you identified outside of src/05-derivatives/06-diffusion-derivatives.md)

[effigies]

Sorry about the delay... Because some of the files are not in common-derivatives, simply changing the target branch won't work.

[effigies]

That said, I can just change to "gray" for common-derivatives, merge it into derivatives, and then this PR can be updated.

[sappelhoff]

cool. @alexandreroutier for simplicity, please revert changes to src/05-derivatives/06-diffusion-derivatives.md here. Then we can merge this.

Afterwards, you are most welcome to make a PR with your changes from src/05-derivatives/06-diffusion-derivatives.md to https://github.com/bids-standard/bids-bep016

[effigies]

I updated derivatives and then merged in here. I think this is ready for review.

[sappelhoff]

Thanks @alexandreroutier