More specific disclaimer for titiler-cmr datasets

[maxrjones]

I just noticed that there's a dataset transformation disclaimer for datasets served via titiler-cmr (https://github.com/NASA-IMPACT/veda-config/blob/1f8b45da33cdd9552016a66978576419758f9f2e/datasets/GPM_3IMERGDF.data.mdx#disclaimer). As we use titiler-cmr and titiler-multidim more, it might be necessary to further customize the disclaimers.