fix link to inplace_upgrade.py

it was moved in 83365f5, but the docs weren't updated

docs/source/el7toel8/actor-rhel7-to-rhel8.md

@@ -62,7 +62,7 @@ For further information about how create an actor read this [document](../first-
 
 Until now, you have created boilerplate of a new actor and made it visible to Leapp. But, Leapp needs some more information about what to do with the actor. Specifically, in which **“workflow”** and in which **“phase”** the actor should be executed. A workflow is a sequence of phases. The only workflow available now is the one solving the upgrade of RHEL 7 to RHEL 8. Each phase is a set of actors that will be executed one after another before the next phase starts. To find out in which workflow and phase should the actor be executed, Leapp looks for **“tags”**. To be part of RHEL 7 to RHEL 8 upgrade workflow, an actor needs to be tagged with **IPUWorkflowTag**.
 
-The phases of the IPUWorkflow (in order) are: **Facts Collection, Checks, Report, Download, Upgrade RamDisk Preparation, Upgrade RamDisk Start, Late Tests, Preparation, RPM Upgrade, Application Upgrade, Third Party Applications, Finalization** and **First Boot**. Each phase has a specific tag that marks an actor as being part of that phase. You can find descriptions of all the phases and their tags [here](https://github.com/oamg/leapp-repository/blob/master/repos/system_upgrade/el7toel8/workflows/inplace_upgrade.py) and workflow diagram [here](../inplace-upgrade-workflow).
+The phases of the IPUWorkflow (in order) are: **Facts Collection, Checks, Report, Download, Upgrade RamDisk Preparation, Upgrade RamDisk Start, Late Tests, Preparation, RPM Upgrade, Application Upgrade, Third Party Applications, Finalization** and **First Boot**. Each phase has a specific tag that marks an actor as being part of that phase. You can find descriptions of all the phases and their tags [here](https://github.com/oamg/leapp-repository/blob/master/repos/system_upgrade/common/workflows/inplace_upgrade.py) and workflow diagram [here](../inplace-upgrade-workflow).
 
 For example, if an actor is to be executed within the Checks phase, it needs to be tagged both with IPUWorkflowTag and ChecksPhaseTag. The result after updating the boilerplate would be: