Updates to OpenMP/MPI Materials Based on August Pilot Feedback

[mehtaparabaci]

Based on feedback from the OpenMP/MPI pilot in August, we’ve updated the course materials to fix errors, clarify concepts, and add examples to make the lessons easier to follow.

OpenMP

• Fixed typos across all episodes.
• Key concepts like private variables, collapse clauses, and reduction were clarified with new explanations and examples.
• Race conditions and barriers were updated with improved standalone code examples (e.g., barriers.c, matrix_update.c) and updates to the corresponding texts
• Refined the reporting progress exercise with better instructions and a fixed solution.
• New explanations and examples for synchronisation, atomic operations were added

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MPI

• Fixed typos and improved clarity across episodes.
• Corrected errors in example code (e.g., fixed type mismatches in "Hello World, Again!").
• Expanded explanations for key topics such as message passing, buffer usage, and derived data types.
• Improved the Ping Pong challenge with output flushing and additional context.
• Added notes on MPI_STATUS_IGNORE and clarified MPI_Broadcast matching send/receive requirements.
• Signposted connections to the derived data type episode for better flow.
• Made example solutions more robust and beginner-friendly.

[abhidg]

Hi @mehtaparabaci looks good! Few minor comments for improvement and some typos.

[mehtaparabaci]

Thanks for the review & feedback @abhidg! I've made the updates-let me know if anything else needs tweaking.