changed ParentScope docs to better reflect best usage

[hstrey]

@YingboMa @ChrisRackauckas
I rewrote the example with ParentScope to better reflect how ParentScope/DelayParentScope should be used. The problem with the old example is that the local definitions of the parameters do not agree with the parameter list. If you define equations, then the parameters in the equations don't match the parameter list, which leads to a situation where parameters(sys) are different than the parameters in equations(sys)

[ai-maintainer]

AI-Maintainer Review for PR - changed ParentScope docs to better reflect best usage

Title and Description 👍

The Title and description are clear, concise and helpful

The title and description of the pull request are clear and concise. They effectively communicate the purpose of the changes, which is to improve the documentation of ParentScope and ensure consistency between the parameter list and the equations.

Scope of Changes 👍

The changes are narrowly focused

The changes in this pull request are narrowly focused on addressing a specific issue related to the documentation of ParentScope. There is no indication that the author is attempting to resolve multiple issues simultaneously.

Testing 👎

Testing details are missing

The provided description does not explicitly mention how the author tested the changes. It would be helpful to include details about the testing approach employed to ensure the changes work as expected.

Code Changes 👍

The code changes are appropriate and align with the stated purpose

The code changes made in the pull request align with the stated purpose of improving the documentation of ParentScope. The changes are clear and seem to address the issue highlighted by the author.

Recommendations

• Please provide details on how the changes were tested. This could be in the form of unit tests, manual testing, or both.
• Ensure that the changes are reflected in all relevant parts of the documentation to maintain consistency.

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