fix(gtfs/spec/reference): fix source of the inlining.svg image

[chtitux]

Currently, on https://gtfs.org/schedule/reference/#shapestxt , the image for shape_dist_traveled is not working:

Moving the image where the other images are and using the same markdown image tag as the other ones should fix the issue.

CLA signed (@chtitux Github name matches)

[eliasmbd]

@chtitux Thanks for posting this here! We appreciate your first contribution to GTFS and we are happy to have you with us. I am sure the community will get back to you in no time. We are also taking the time to review your PR at MobilityData.

While you wait, I would like to invite you to the MobilityData slack where you can join in realtime chat and engage with the rest of the GTFS community.

[Sergiodero]

Thanks @chtitux, after having a quick look I noticed that the reason this format is used to reference the image is to contain its size. With the suggested format the image takes up quite a bit of space, so I wouldn't suggest merging as is right now.

I think we might revisit this problem to propose a better, more standardized way of structuring assets in each folder across the repo, but it might take a few weeks for us to be able to take a stab at it.

In the meantime we'll manually make adjustments in gtfs.org.

Thanks again!