Update imports for pong to pong_v3 in AEC and Parallel sections

[kuds]

Description

Updating Pong's Index.html to include the correct import to pong_v3 in AEC and Parallel section.

Fixes #1235

Type of change

Documentation only change

Screenshots

Before Screenshots

Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have run pytest -v and no errors are present.
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I solved any possible warnings that pytest -v has generated that are related to my code to the best of my knowledge.
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[kuds]

Closing pull request as not the correct solution. Solution should live in the master branch, not the gh-pages branch