[8.13] Revises 8.x-8.x upgrade guide (backport #5830) #5986
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Contributes to #5302.
Revises the instructions for upgrading from an 8.x to an 8.x version. Mostly reuses the content from the 7.17 to 8.x upgrade guide, but without the 7.17-specific information.
This is an automatic backport of pull request #5830 done by Mergify.