Add version update event to the activity tracker information

[dreiucker]

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Description

Add information about update events to the activity tracker information.

Any other comments?

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[andrealang]

@dreiucker Thank you! This is the wrong repo though, so I'll make this update in our regular repo here: https://github.ibm.com/cloud-docs-solutions/cloud-databases

[andrealang]

Done: https://github.ibm.com/cloud-docs-solutions/cloud-databases/blob/source/at-events.md