The document is a bit deceptive. While JSD can theoretically be updated more often than the underlying Jira platform, most JSD releases are tied to a specific version of Jira. From your screenshot it looks like you have Jira 7.9 and Service Desk 3.12, which are paired. Service Desk 3.13 is paired with Jira 7.10 - so you would need to do a platform upgrade in order to upgrade Service Desk as well.
Some releases of Service Desk earlier in the series released on the same platform versions, for example 3.6 and 3.7 both could run on 7.4. That's why the minor version numbers don't quite line up - initially JSD 3.0 ran on Jira 7.0 but a few JSD releases got ahead of platform. The documentation is written for those versions that might have had multiple JSD releases on the same Jira platform version.
You can use this Compatibility Matrix to figure out which version of Jira you need for a particular version of Service Desk. For instance, expanding out the Jira 7.12 line shows that you can run Service Desk 3.15 on it. Hope this helps clear things up!
Cheers,
Daniel
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