Descripe the doc issue

I am using opencv to store and open an int32 array to and from file. However, I noticed that isn't listed as a supported option in the documentation.

https://docs.opencv.org/4.7.0/d4/da8/group__imgcodecs.html#gabbc7ef1aa2edfaa87772f1202d67e0ce

Fix suggestion

Mention that tiff has more formats available.