All the scrum events are timeboxed.

The DoD helps the developers know how much work needs to be done, and therefore they can

decide what should be part of the sprint. It also creates a shared understanding of what done means.

This is likely to include documentation, but that depends on the decisions of the organization and

team. Scrum does not dictate this.

Specific roles don't exist in scrum, developers are creating the value.

If you are not sure, please review the section scrum artifacts in the scrum guide.

Product owner is value optimizer. Of the product, which emerges by the work of the developers.

The working increment is the goal of the sprint and should be kept in mind. The self-managing aspect

of the teams is also crucial to take in mind. Stable velocity and optimally used developers are not the

scrum master's concern.

The first way of DevOps emphasizes optimizing the flow of work from development to operations to

deliver value to customers earlier and more frequently, reducing lead time.

These are all potentional topics for the sprint review. If you are not sure, please read the sprint review section in the scrum guide again.

The refinement is very important and can take quite some time for that reason, however, it should

not endanger the sprint goal.

Naming conventions help to make the code more readable and it can reduce naming clashes.