Apply feedback from the comments

Author: sanketverma1704

datasets/index.md

@@ -28,5 +28,8 @@ Below is a list of a few examples of public datasets.<br><br>
 feel free to send a PR to the website <a href="https://github.com/zarr-developers/zarr-developers.github.io/">repository</a>.<br><br>
 
 Please ensure the dataset you're adding to the list is public, free to use,
-documented, represents Zarr's use case in a specific domain, and is stable/maintained. 
+documented, and illustrate the application of Zarr within a specific domain.<br><br>
+
+Please only include URLs that you expect to be stable and maintained and is
+stable/maintained in the foreseeable future.
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