Document how to update a "develop branch to develop branch" pull request

[martinAmouzou]

What this PR does / why we need it: This PR is to solve the issue 9508 on how to "update a develop branch to develop branch" pull request

Which issue(s) this PR closes:

• Closes #9508

Special notes for your reviewer:

Suggestions on how to test this: The modifications are on the latest section of the doc (version-control.rst)

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?: No

Additional documentation: