Fixed XML tag

[adriancuadrado]

Replace this paragraph with a short description of what issue this pull request (PR) solves and provide a description of the change. Consider including before/after screenshots.

List at least one fixed issue.

Pre-launch Checklist

• I made sure the project builds.
• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is does not need version changes.
• I updated CHANGELOG.md to add a description of the change.
• I updated/added relevant documentation (doc comments with ///).
• I rebased onto main.
• I added new tests to check the change I am making, or this PR does not need tests.
• I made sure all existing and new tests are passing.
• I ran dart format . and committed any changes.
• I ran flutter analyze and fixed any errors.

I haven't marked many checkboxes of the list above because the change is too small and I only changed a markdown file, so it should be fine. I haven't rebased onto main because I made the change directly using the Github UI.

[adriancuadrado]

I kept reading the documentation and then I realized the </details> tag was in the wrong place so I took advantage of this PR to also fix that.