I think he means that he can "link" a version in the comment, like an issue can be linked automatically when writing the comment.
I've added a screenshot with an example, when wring the Fix version, it is written as normal text and not as a link.
Thank you for reaching out to Atlassian Community!
When adding a version in a comment, currently, there are no shortcuts to make the version clickable.
The workaround, for now, is to copy the link and add to the comment using the feature.
There is a feature request suggesting the implementation of this ability:
Please, click on vote and watch to receive updates about the feature.
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