changes Hawthorn to Ironwood in upgrade section

Description

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    1. [DOC-XXXX](https://openedx.atlassian.net/browse/DOC-XXXX)

In Upgrade section docs said to make a fresh installation of Hawthorn release instead of Ironwood.

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      1. Date Needed (optional)

If the release date of a feature is known or estimated, provide it to give reviewers guidance on turnaround time.

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      1. Reviewers

Possible roles follow. The PR submitter checks the boxes after each reviewer finishes and gives :+1:.

  • [ ] Subject matter expert:

  • [ ] Subject matter expert:

  • [ ] Doc team review (sanity check, copy edit, or dev edit?): @edx/doc

  • [ ] Product review:

  • [ ] Partner support:

  • [ ] PM review:

FYI: Tag anyone else who might be interested in this PR here.

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      1. Testing

  • [ ] Ran ./run_tests.sh without warnings or errors

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      1. HTML Version (optional)

  • [ ] Build an RTD draft for your branch and add a link here

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      1. Sandbox (optional)

  • [ ] Point to or build a sandbox for the software change and add a link here

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      1. Post-review

  • [ ] Add a comment with the description of this change or link this PR to the next release notes task.

  • [ ] Squash commits

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Open Source Pull Request Bot

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edx/edx-documentation

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Site Delivery & Infrastructure

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