Improve license documentation page

Issue Summary

In our license management documentation pages it's not clear how to update your Confluence license if you for example need to extend your support maintenance period.

https://confluence.atlassian.com/doc/managing-your-confluence-license-313467774.html

There should be some indication that if you purchase a new support license or extend an existing license using my.atlassian.com that you need to copy and paste the license into the relevant place in the Confluence administration area. This is not mentioned and many customers are not certain of this procedure or the relationship between the two licensing areas.

Steps to Reproduce

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Expected Results

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Actual Results

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Workaround

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